Case, E. C., & Bergsmark, D. R. (1932). College geography. J. Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Case, Earl Clark, agus Daniel R. Bergsmark. College Geography. New York: J. Wiley and Sons, 1932.
Lua MLA (9ú heag.)Case, Earl Clark, agus Daniel R. Bergsmark. College Geography. J. Wiley and Sons, 1932.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.