APA Citatie

Bishop, M. S., & Lewis,Phyllis G. (1972). Focus on earth science (2nd ed.). Charles E. Merrill.

Chicago Style citaat

Bishop, Margaret S., en Lewis,Phyllis G. Focus on Earth Science. 2nd ed. Columbus: Charles E. Merrill, 1972.

MLA citatie

Bishop, Margaret S., en Lewis,Phyllis G. Focus on Earth Science. 2nd ed. Charles E. Merrill, 1972.