1. ^{{cite journal|last=Wolfe|first=J.A.|last2=Wehr |first2=W.C. |year=1988 |title=Rosaceous Chamaebatiaria-like foliage from the Paleogene of western North America |journal=Aliso |volume= 12 |issue=1 |pages= 177–200 |url= https://pubs.er.usgs.gov/publication/70014287}}
2. ^^1 2 {{cite journal |last1=Dlussky |first1=G. M. |year=1988 |title=Ants of Sakhalin amber (Paleocene?) |journal=Paleontologicheskii Zhurnal |volume=1988 |issue=1 |pages=50–61 |url=http://antcat.s3.amazonaws.com/884/5739.pdf?AWSAccessKeyId=AKIAJJR3DGROFMVL2FBQ&Expires=1500428920&Signature=KA7jsuMdjMIJMuVnNTfxKs430j4%3D |language=Russian }}{{Dead link|date=August 2018 |bot=InternetArchiveBot |fix-attempted=yes }}
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15. ^¹ {{Cite journal|author1=Dan Grigorescu |author2=Jenö Kessler |year=1988 |title=New Contributions to the Knowledge of the Sarmatian Birds from South Dobrogea in the Frame of the Eastern Paratethyan Avifauna |url= |journal=Revue Roumaine de Géologie, Géophysique et Géographie, [Série]: Géologie |volume=32 |issue= |pages=91–97 }}
16. ^{{Cite journal|author=Steven D. Emslie |year=1988 |title=The Fossil History and Phylogenetic Relationships of Condors (Ciconiiformes: Vulturidae) in the New World |journal=Journal of Vertebrate Paleontology |volume=8 |issue= 2|pages=212–228 |doi=10.1080/02724634.1988.10011699}}
17. ^{{Cite journal|author=Steven D. Emslie |year=1988 |title=An Early Condor-like Vulture from North America |url=http://sora.unm.edu/sites/default/files/journals/auk/v105n03/p0529-p0535.pdf |journal=The Auk |volume=105 |issue=3 |pages=529–535 }}
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19. ^^1 2 3 {{Cite journal|author=Peter W. Houde |year=1988 |title=Paleognathous Birds from the Early Tertiary of the Northern Hemisphere |url= |journal=Publication of the Nuttall Ornithological Club |volume=22 |issue= |pages=1–148 }}
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21. ^¹ {{Cite journal|author=Philip R. Millener |year=1988 |title=Contributions to New Zealand's Late Quaternary Avifauna. I: Pachyplichas, a New Genus of Wren (Aves: Acanthisittidae), with Two New Species |journal=Journal of the Royal Society of New Zealand |volume=18 |issue=4 |pages=383–406 |doi=10.1080/03036758.1988.10426464}}
22. ^{{Cite journal|author=James L. Goedert |year=1988 |title=A New Late Eocene Species of Plotopteridae (Aves: Pelecaniformes) from Northwestern Oregon |url=https://www.biodiversitylibrary.org/page/15775765#page/111/mode/1up |journal=Proceedings of the California Academy of Sciences |volume=45 |issue=6 |pages=97–102 }}
23. ^{{Cite journal|author=David W. Steadman |year=1988 |title=A New Species of Porphyrio (Aves: Rallidae) from Archeological Sites in the Marquesas Islands |url=https://www.biodiversitylibrary.org/page/34645843#page/180/mode/1up |journal=Proceedings of the Biological Society of Washington |volume=101 |issue=1 |pages=162–170 }}
24. ^^1 2 3 {{Cite journal|author=Cécile Mourer-Chauviré |year=1988 |title=Le Gisement du Bretou (Phosphorites du Quercy, Tarn-et-Garonne, France) et sa Faune de Vertébrés de l'Éocène Supérieur II. Oiseaux |url= |journal=Paleontographica A |volume=205 |issue= |pages=29–50 }}
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26. ^{{Cite journal |author1=Gerard F. van Tets |author2=Charles W. Meredith |author3=Peter J. Fullagar |author4=Peter M. Davidson |year=1988 |title=Osteological Differences Between Sula and Morus, and a Description of an Extinct New Species of Sula from Lord Howe and Norfolk islands, Tasman Sea |url=http://extinct-website.com/pdf/Notornis_35_1_35_57.pdf |journal=Notornis |volume=35 |issue=1 |pages=35–57 |access-date=2014-08-23 |archive-url=https://web.archive.org/web/20140826120447/http://extinct-website.com/pdf/Notornis_35_1_35_57.pdf |archive-date=2014-08-26 |dead-url=yes |df= }}
27. ^{{Cite journal|author=Herculano M. F. de Alvarenga |year=1988 |title=Ave Fóssil (Gruiformes: Rallidae) dos Folhelhos da Bacia de Taubaté, Estado de São Paulo, Brasil |url= |journal=Anais da Academia Brasileira de Ciências |volume=60 |issue= |pages=321–328 }}
28. ^{{Cite journal|author=Cécile Mourer-Chauviré |year=2000 |title=A New Species of Ameripodius (Aves: Galliformes: Quercymegapodiidae) from the Lower Miocene of France |journal=Palaeontology |volume=43 |issue=3 |pages=481–493 |doi=10.1111/j.0031-0239.2000.00136.x}}
29. ^^1 2 {{Cite journal|author=Lev A. Nessov |year=1988 |title=Novyye ptitsy mela i paleogena Sredney Azii i Kazakhstana i usloviya na mestakh ikh obitaniya. [New Cretaceous and Paleogene Birds from Middle Asia and Kazakhstan, and the Condition Existing at Theire Places of Residence.] [in Russian, with English sum.]. |url= |journal=Trudy Zoologicheskogo Instituta Akademii Nauk SSSR |volume=182 |issue= |pages=116–123 }}
30. ^Kellner, A.W.A., and Campos, D.A. (1988). "Sobre un novo pterossauro com crista sagital da Bacia do Araripe, Cretaceo Inferior do Nordeste do Brasil. (Pterosauria, Tupuxuara, Cretaceo, Brasil)." Anais da Academia Brasileira de Ciências, 60: 459–469. [in Portuguese]