Citazione Stile APA (7a Edizione)

Ackerman, E. A. (1958). Geography as a fundamental research discipline. University of Chicago.

Citazione stile Chigago Style (17a edizione)

Ackerman, Edward A. Geography as a Fundamental Research Discipline. Chicago: University of Chicago, 1958.

Citatione MLA (9a ed.)

Ackerman, Edward A. Geography as a Fundamental Research Discipline. University of Chicago, 1958.