Boehm, R. G. (1995). Glencoe world geography: A physical and cultural approach (Texas ed.). New York: Glencoe/McGraw-Hill.
Dyfyniad Arddull ChicagoBoehm, Richard G. Glencoe World Geography: A Physical and Cultural Approach. Texas ed. New York: Glencoe/McGraw-Hill, 1995.
Dyfyniad MLABoehm, Richard G. Glencoe World Geography: A Physical and Cultural Approach. Texas ed. New York: Glencoe/McGraw-Hill, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.