APA (7th ed.) Citation

Williams, W. D. (1970). A revision of North American epigean species of Asellus (Crustacea: Isopoda). Smithsonian Inst. Press.

Chicago Style (17th ed.) Citation

Williams, William David. A Revision of North American Epigean Species of Asellus (Crustacea: Isopoda). Washington: Smithsonian Inst. Press, 1970.

MLA (9th ed.) Citation

Williams, William David. A Revision of North American Epigean Species of Asellus (Crustacea: Isopoda). Smithsonian Inst. Press, 1970.