APA (7th ed.) Citation

Crone, G. R. (1970). Modern geographers: An outline of progres in geography since A.D. 1800 (Rev. & enl. ed.). Royal Geographical Society.

Chicago Style (17th ed.) Citation

Crone, Gerald Roe. Modern Geographers: An Outline of Progres in Geography Since A.D. 1800. Rev. & enl. ed. London: Royal Geographical Society, 1970.

MLA (9th ed.) Citation

Crone, Gerald Roe. Modern Geographers: An Outline of Progres in Geography Since A.D. 1800. Rev. & enl. ed. Royal Geographical Society, 1970.