Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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