Dyfyniad APA

Christopherson, R. W. (1994). Geosystems: An introduction to physical Geography (2nd ed.). Macmillan.

Dyfyniad Arddull Chicago

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. Englewood Cliffs: Macmillan, 1994.

Dyfyniad MLA

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. Macmillan, 1994.

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