Cita APA (7a ed.)

Freeman, M. M. R. (1984). Arctic ecosystems. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Freeman, Milton M. R. Arctic Ecosystems. Washington: Smithsonian Institution, 1984.

Cita MLA (9a ed.)

Freeman, Milton M. R. Arctic Ecosystems. Smithsonian Institution, 1984.