APA (7th ed.) Citation

Darwin, C. (2010). A Monograph on the Sub-class Cirripedia (Volume 1 of 2) The Lepadidae; Or, Pedunculated Cirripedes. Project Gutenberg.

Chicago Style (17th ed.) Citation

Darwin, Charles. A Monograph on the Sub-class Cirripedia (Volume 1 of 2) The Lepadidae; Or, Pedunculated Cirripedes. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Darwin, Charles. A Monograph on the Sub-class Cirripedia (Volume 1 of 2) The Lepadidae; Or, Pedunculated Cirripedes. Project Gutenberg, 2010.

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