Winston, B. J. (1991). Geography: Our country and our world. Scott, Foresman and Co..
Dyfyniad Arddull ChicagoWinston, Barbara J. Geography: Our Country and Our World. Glenview: Scott, Foresman and Co., 1991.
Dyfyniad MLAWinston, Barbara J. Geography: Our Country and Our World. Scott, Foresman and Co., 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.