APA

Swingland I. R., Klemens M. W., . (1989). The Conservation biology of tortoises. Gland, Switzerland: IUCN--the World Conservation Union.

Chicago

Swingland Ian R, Klemens Michael W, . 1989. The Conservation biology of tortoises. Gland, Switzerland: IUCN--the World Conservation Union.

Harvard

Swingland I. R., Klemens M. W., . (1989). The Conservation biology of tortoises. Gland, Switzerland: IUCN--the World Conservation Union.

MLA

Swingland Ian R, Klemens Michael W, . The Conservation biology of tortoises. Gland, Switzerland: IUCN--the World Conservation Union. 1989.