Christopherson, R. W. (1994). Applied physical geography: Geosystems in the laboratory. Macmillan.
Lua i Stíl Chicago (17ú heag.)Christopherson, Robert W. Applied Physical Geography: Geosystems in the Laboratory. New York: Macmillan, 1994.
Lua MLA (9ú heag.)Christopherson, Robert W. Applied Physical Geography: Geosystems in the Laboratory. Macmillan, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.