1. ^{{cite book | author = Brooklyn. Public Library | title = 1971 film catalog | url = https://books.google.com/books?id=o08rAAAAMAAJ | year = 1971 | publisher = s.n. | pages = 4– | quote = Angel 7 min. BW A young man, a girl and a dog play in the snow. The film and the action are overexposed giving the effect ... written by Derek May. Music by Leonard Cohen. National Film Board of Canada; Contemporary/McGraw-Hill. 1966.}}
2. ^{{cite book | author = Gary Evans | title = In the National Interest: A Chronicle of the National Film Board of Canada from 1949 to 1989 | url = https://books.google.com/books?id=JDJAAQAAIAAJ | year = 1991 | publisher = University of Toronto Press | isbn = 978-0-8020-2784-9 | pages = 157– | quote = ... telephoto lens to observe a long-distance bicycle race in Quebec; a year later, in 1966, Derek May's seven-minute short Angel ($7,467) demonstrated the fascinating uses of high-contrast images in a fantasy, with poetry by Leonard Cohen.}}
3. ^{{cite book | title = Journal of Canadian Studies: Revue D'études Canadiennes | url = https://books.google.com/books?id=O7c1AAAAIAAJ | year = 1981 | publisher = Trent University | pages = 37– | quote = ... May's work forms itself rather neatly into four distinct groups, and for the purposes of this essay I will approach the films in pairs: Angel (1966) and Pandora (1971), ... Set to the wistful and vital music of Leonard Cohen, Angel uses a pair of angel's wings that the man wants to borrow ...}}
4. ^{{cite web | url = http://www.onf-nfb.gc.ca/eng/collection/film/?id=10996 | title = Angel | year = 1966 | work = Film Collection | publisher = National Film Board of Canada Web site | accessdate = 2009-08-31}}
5. ^{{cite news | last1 = Ryan | first1 = Terry | title = Derek May: a cosmic weatherman | url = https://news.google.com/newspapers?nid=1946&dat=19690927&id=jJcuAAAAIBAJ&sjid=mqEFAAAAIBAJ&pg=3559,7158139&hl=en | accessdate = 6 October 2016 | work = Montreal Gazette | date = 27 September 1969}}