Citazione Stile APA (7a Edizione)

Unwin, D. J., & Dawson, J. A. (1985). Computer programming for geographers. Longman.

Citazione stile Chigago Style (17a edizione)

Unwin, David John, e John A. Dawson. Computer Programming for Geographers. London: Longman, 1985.

Citatione MLA (9a ed.)

Unwin, David John, e John A. Dawson. Computer Programming for Geographers. Longman, 1985.