APA (7th ed.) Citation

Haeckel, E., & Lankester, E. R. (2012). The History of Creation, Vol. II (of 2) Or the Development of the Earth and its Inhabitants by the Action of Natural Causes. Project Gutenberg.

Chicago Style (17th ed.) Citation

Haeckel, Ernst, and E. Ray Lankester. The History of Creation, Vol. II (of 2) Or the Development of the Earth and Its Inhabitants by the Action of Natural Causes. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Haeckel, Ernst, and E. Ray Lankester. The History of Creation, Vol. II (of 2) Or the Development of the Earth and Its Inhabitants by the Action of Natural Causes. Project Gutenberg, 2012.

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