APA (7th ed.) Citation

Petrunkevitch, A. (1949). A study of Palaeozoic Arachnida. Connecticut Academy of Arts and Sciences.

Chicago Style (17th ed.) Citation

Petrunkevitch, Alexander. A Study of Palaeozoic Arachnida. New Haven: Connecticut Academy of Arts and Sciences, 1949.

MLA (9th ed.) Citation

Petrunkevitch, Alexander. A Study of Palaeozoic Arachnida. Connecticut Academy of Arts and Sciences, 1949.

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