Cita APA

Spangle, P. J. 1., & Perkins, P. D. (1989). A revision of the neotropical aquatic beetle genus Stenhelmoides (Coleoptera: Elmidae). Washington: Smithsonian Institution Press.

Citación estilo Chicago

Spangle, Paul J. 1924-2011, y Philip D. Perkins. A Revision of the Neotropical Aquatic Beetle Genus Stenhelmoides (Coleoptera: Elmidae). Washington: Smithsonian Institution Press, 1989.

Cita MLA

Spangle, Paul J. 1924-2011, y Philip D. Perkins. A Revision of the Neotropical Aquatic Beetle Genus Stenhelmoides (Coleoptera: Elmidae). Washington: Smithsonian Institution Press, 1989.