Gaya APA

Swanson, C, P., Koren, H. (1980). Handbook of envitonmental health and safety principles and practice . New York: New York: Pergamon Press; 1980.

Gaya MLA

Swanson, Carl, P.., Koren, Herman. "Handbook of envitonmental health and safety principles and practice". New York: New York: Pergamon Press; 1980, 1980. Text.