APA (7th ed.) Zitazioa

Barber, G. M. (1988). Elementary statistics for geographers. The Guilford pr.

Chicago Style (17th ed.) Zitazioa

Barber, Gerald M. Elementary Statistics for Geographers. New York: The Guilford pr, 1988.

MLA (9th ed.) Zitazioa

Barber, Gerald M. Elementary Statistics for Geographers. The Guilford pr, 1988.