APA ציטוט

Spencer, E. W. (2003). Earth science: Understanding environmental systems. Boston: McGraw-Hill.

Trích dẫn kiểu Chicago

Spencer, Edgar W. Earth Science: Understanding Environmental Systems. Boston: McGraw-Hill, 2003.

ציטוט MLA

Spencer, Edgar W. Earth Science: Understanding Environmental Systems. Boston: McGraw-Hill, 2003.