APA-referens (7:e uppl.)
Bünning, E. (1989). Ahead of his time, Wilhelm Pfeffer: Early advances in plant biology. Carleton University Press.
Chicago-referens (17:e uppl.)
Bünning, Erwin. Ahead of His Time, Wilhelm Pfeffer: Early Advances in Plant Biology. Ottawa, Canada: Carleton University Press, 1989.
MLA-referens (9:e uppl.)
Bünning, Erwin. Ahead of His Time, Wilhelm Pfeffer: Early Advances in Plant Biology. Carleton University Press, 1989.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.