Bradshaw, M. J., & Weaver, R. (1995). Foundations of physical geography. Wm. C. Brown.
Lua i Stíl Chicago (17ú heag.)Bradshaw, Michael J., agus Ruth Weaver. Foundations of Physical Geography. Dubuque, IA: Wm. C. Brown, 1995.
Lua MLA (9ú heag.)Bradshaw, Michael J., agus Ruth Weaver. Foundations of Physical Geography. Wm. C. Brown, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.