Παραπομπή APA

Viorst, J. (1967). The changing earth. Bantam Books.

Παραπομπή Chicago Style

Viorst, Judith. The Changing Earth. New York: Bantam Books, 1967.

Παραπομπή MLA

Viorst, Judith. The Changing Earth. Bantam Books, 1967.