APA (7th ed.) Citation

Duellman, W. E. (2010). Descriptions of New Hylid Frogs From Mexico and Central America. Project Gutenberg.

Chicago Style (17th ed.) Citation

Duellman, William Edward. Descriptions of New Hylid Frogs From Mexico and Central America. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Duellman, William Edward. Descriptions of New Hylid Frogs From Mexico and Central America. Project Gutenberg, 2010.

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