Dyfyniad APA

Heintzelman, O. H., & Highsmith, R. M. (1963). World regional geography (2nd ed.). Prentice-Hall.

Dyfyniad Arddull Chicago

Heintzelman, Oliver Harry, and Richard Morgan Highsmith. World Regional Geography. 2nd ed. Englewood Cliffs, N.J: Prentice-Hall, 1963.

Dyfyniad MLA

Heintzelman, Oliver Harry, and Richard Morgan Highsmith. World Regional Geography. 2nd ed. Prentice-Hall, 1963.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.