APA (7th ed.) Citation

Darwin, C. A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc.

Chicago Style (17th ed.) Citation

Darwin, Charles. A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, Etc., Etc.

MLA (9th ed.) Citation

Darwin, Charles. A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, Etc., Etc.

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