APA (7th ed.) Citation

Minckley, W. L., & Cross, F. B. (2011). Five Natural Hybrid Combinations in Minnows (Cyprinidae). Project Gutenberg.

Chicago Style (17th ed.) Citation

Minckley, W. L., and Frank B. Cross. Five Natural Hybrid Combinations in Minnows (Cyprinidae). Project Gutenberg, 2011.

MLA (9th ed.) Citation

Minckley, W. L., and Frank B. Cross. Five Natural Hybrid Combinations in Minnows (Cyprinidae). Project Gutenberg, 2011.

Warning: These citations may not always be 100% accurate.