Cita APA (7a ed.)

Olsen, O. W. (1974). Animal parasites: Their life cycles and ecology (3rd ed.). University Park Press.

Cita Chicago Style (17a ed.)

Olsen, O. Wilford. Animal Parasites: Their Life Cycles and Ecology. 3rd ed. Baltimore [etc.]: University Park Press, 1974.

Cita MLA (9a ed.)

Olsen, O. Wilford. Animal Parasites: Their Life Cycles and Ecology. 3rd ed. University Park Press, 1974.