Cita APA (7th ed.)

Silk, J. (1979). Statistical concepts in geography. Allen and Unwin.

Cita Chicago (17th ed.)

Silk, John. Statistical Concepts in Geography. London ; Boston: Allen and Unwin, 1979.

Cita MLA (8th ed.)

Silk, John. Statistical Concepts in Geography. Allen and Unwin, 1979.