Gaya APA

DAVY, F, X., Burkhart, R, E. (1970). Perspectives on our time issues and essays . New York: Houghton Mifflin.

Gaya MLA

DAVY, Francis, X., Burkhart, ROBERT, E. "Perspectives on our time issues and essays". New York: Houghton Mifflin, 1970. Buku.