Broek, J. O. M., & Webb, J. W. (1968). A geography of mankind. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Broek, Jan O. M., agus John Winter Webb. A Geography of Mankind. New York: McGraw-Hill, 1968.
Lua MLA (8ú heag.)Broek, Jan O. M., agus John Winter Webb. A Geography of Mankind. McGraw-Hill, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.