Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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