APA (7th ed.) Citation

Crone, G. R. (1970). Moderns geographers: An outline of progress in geography since AD 1800 (Rev. and enlarged ed.). Royal Geographical Society.

Chicago Style (17th ed.) Citation

Crone, G. R. Moderns Geographers: An Outline of Progress in Geography Since AD 1800. Rev. and enlarged ed. London: Royal Geographical Society, 1970.

MLA (9th ed.) Citation

Crone, G. R. Moderns Geographers: An Outline of Progress in Geography Since AD 1800. Rev. and enlarged ed. Royal Geographical Society, 1970.

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