APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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