Παραπομπή APA

Young, K. (1975). Geology: The paradox of earth and man. Houghton.

Παραπομπή Chicago Style

Young, Keith. Geology: The Paradox of Earth and Man. Boston: Houghton, 1975.

Παραπομπή MLA

Young, Keith. Geology: The Paradox of Earth and Man. Houghton, 1975.