APA (7e ed.) Bronvermelding

Gabler, R. E. (1982). Essentials of physical geography. Sounders College Publ.

Chicago (17e ed.) Bronvermelding

Gabler, Robert E. Essentials of Physical Geography. Sounders College Publ, 1982.

MLA (8e ed.) Bronvermelding

Gabler, Robert E. Essentials of Physical Geography. Sounders College Publ, 1982.

Let op: Deze citaties zijn niet altijd 100% accuraat.