APA (7th ed.) Citation

Claassen, P. W. (1931). Plecoptera nymphs of America (north of Mexico). Pub. for the Thomas Say Foundation by C.C. Thomas.

Chicago Style (17th ed.) Citation

Claassen, P. W. Plecoptera Nymphs of America (north of Mexico). Springfield, Ill., Baltimore, Md.: Pub. for the Thomas Say Foundation by C.C. Thomas, 1931.

MLA (9th ed.) Citation

Claassen, P. W. Plecoptera Nymphs of America (north of Mexico). Pub. for the Thomas Say Foundation by C.C. Thomas, 1931.