APA (7th ed.) Citation

Leighton, G. R. (2011). Embryology The Beginnings of Life. Project Gutenberg.

Chicago Style (17th ed.) Citation

Leighton, Gerald R. Embryology The Beginnings of Life. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Leighton, Gerald R. Embryology The Beginnings of Life. Project Gutenberg, 2011.

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