Cita APA (7a ed.)

Gustafson, A. F. (1949). Conservation in the United States (3rd ed.). Comstock.

Cita Chicago Style (17a ed.)

Gustafson, A. F. Conservation in the United States. 3rd ed. Ithaca: Comstock, 1949.

Cita MLA (9a ed.)

Gustafson, A. F. Conservation in the United States. 3rd ed. Comstock, 1949.