Rugh, R. (1951). The Frog: Its reproduction and development. McGraw-Hill Book Co., Inc.
Chicago-referens (17:e uppl.)Rugh, Roberts. The Frog: Its Reproduction and Development. New Delhi: McGraw-Hill Book Co., Inc, 1951.
MLA-referens (9:e uppl.)Rugh, Roberts. The Frog: Its Reproduction and Development. McGraw-Hill Book Co., Inc, 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.