Lua APA (7ú heag.)
Marshall, R., & Rosskopf, A. (2001). AGS Earth Science. American Guidance Service inc.
Lua i Stíl Chicago (17ú heag.)
Marshall, Robert, agus Allen Rosskopf. AGS Earth Science. Minnesota: American Guidance Service inc, 2001.
Lua MLA (9ú heag.)
Marshall, Robert, agus Allen Rosskopf. AGS Earth Science. American Guidance Service inc, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.