Cita APA (7a ed.)

Crone, G. (1960). Modern geographers: An outline of progress in geography since 1800 A.D. The Royal Geographical Society.

Cita Chicago Style (17a ed.)

Crone, G.R. Modern Geographers: An Outline of Progress in Geography Since 1800 A.D. London: The Royal Geographical Society, 1960.

Cita MLA (9a ed.)

Crone, G.R. Modern Geographers: An Outline of Progress in Geography Since 1800 A.D. The Royal Geographical Society, 1960.