Gaya APA

BOYER, R, E., Higgins, J, L. (1970). ACTIVITIES AND DEMONSTRATIONS FOR EARTH SCIENCE . New York: PARKER PUBLISHING Co., Inc.

Gaya MLA

BOYER, Robert, E.., Higgins, John, L.. "ACTIVITIES AND DEMONSTRATIONS FOR EARTH SCIENCE". New York: PARKER PUBLISHING Co., Inc, 1970. Textbook.