1. ^W. Michael Matthes, "Peter Gerhard (1920-2006)" The Americas Volume 63, Number 1, July 2006 pp. 137-138
2. ^Peter Gerhard, Guide to the Historical Geography of New Spain. University of Oklahoma Press 1993. {{ISBN|978-0806125534}}
3. ^Peter Gerhard, The North Frontier of New Spain Revised, Subsequent Edition, University of Oklahoma Press {{ISBN|978-0806125442}}
4. ^Peter Gerhard, The Southeast Frontier of New Spain. University of Oklahoma Press 1993, {{ISBN|978-0806125435}}
5. ^Gerhard, Peter "El Avance Español En México Y Centroamérica." Historia Mexicana 9, no. 1 (1959): 143-52. https://www.jstor.org/stable/25134993.
6. ^Gerhard, Peter. "Descripciones Geográficas (pistas para Investigadores)." Historia Mexicana 17, no. 4 (1968): 618-27. https://www.jstor.org/stable/25134714.
7. ^Gerhard, Peter. "Congregaciones de Indios En La Nueva España Antes De 1570." Historia Mexicana 26, no. 3 (1977): 347-95. https://www.jstor.org/stable/25135561.
8. ^Gerhard, Peter. "Un Censo de la Diócesis De Puebla En 1681." Historia Mexicana 30, no. 4 (1981): 530-60. https://www.jstor.org/stable/25135756.
9. ^Gerhard, P., & Gulick, H. E. (1967). Lower California Guidebook: a descriptive traveler's guide (Vol. 1). AH Clark Company.{{ISBN|978-0870620164}}
10. ^Gerhard, Peter. "Gabriel González, Last Dominican in Baja California." Pacific Historical Review 22, no. 2 (1953): 123-27. doi:10.2307/4492027.
11. ^Gerhard, Peter. "Misiones de Baja California." Historia Mexicana 3, no. 4 (1954): 600-05. https://www.jstor.org/stable/25134350.
12. ^Gerhard, Peter, and W. Michael Mathes. "Peregrinations of the Baja California Mission Registers." The Americas 52, no. 1 (1995): 71-80. doi:10.2307/1008085.