APA Citation

Ward, B. (1968). Spaceship earth. New York: Columbia University Press.

Trích dẫn kiểu Chicago

Ward, Barbara. Spaceship Earth. New York: Columbia University Press, 1968.

MLA Citation

Ward, Barbara. Spaceship Earth. New York: Columbia University Press, 1968.

Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.