APA (7th ed.) Citation
Marshall, R., & Rosskopf, A. (2001). AGS Earth Science. American Guidance Service inc.
Chicago Style (17th ed.) Citation
Marshall, Robert, and Allen Rosskopf. AGS Earth Science. Minnesota: American Guidance Service inc, 2001.
MLA (9th ed.) Citation
Marshall, Robert, and Allen Rosskopf. AGS Earth Science. American Guidance Service inc, 2001.
Warning: These citations may not always be 100% accurate.