APA (7th ed.) Citation

Crone, G. R. (1951). Modern geographers: An outline of progress in geography since 1800 A.D. Royal Geographical Society.

Chicago Style (17th ed.) Citation

Crone, G. R. Modern Geographers: An Outline of Progress in Geography Since 1800 A.D. London: Royal Geographical Society, 1951.

MLA (8th ed.) Citation

Crone, G. R. Modern Geographers: An Outline of Progress in Geography Since 1800 A.D. Royal Geographical Society, 1951.

Warning: These citations may not always be 100% accurate.