APA

Darwin C., Ritvo H., . (1998). The variation of animals and plants under domestication, 1. Baltimore: Johns Hopkins University Press.

Chicago

Darwin Charles, Ritvo Harriet, . 1998. The variation of animals and plants under domestication, 1. Baltimore: Johns Hopkins University Press.

Harvard

Darwin C., Ritvo H., . (1998). The variation of animals and plants under domestication, 1. Baltimore: Johns Hopkins University Press.

MLA

Darwin Charles, Ritvo Harriet, . The variation of animals and plants under domestication, 1. Baltimore: Johns Hopkins University Press. 1998.