APA-referens (7:e uppl.)
Pielou, E. C. (1991). After the Ice Age: The return of life to glaciated North America. University of Chicago Press.
Chicago-referens (17:e uppl.)
Pielou, E. C. After the Ice Age: The Return of Life to Glaciated North America. Chicago: University of Chicago Press, 1991.
MLA-referens (9:e uppl.)
Pielou, E. C. After the Ice Age: The Return of Life to Glaciated North America. University of Chicago Press, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.