APA (7th ed.) Citation

Williams, W., & Bonnor, G. (1798). First principles of geography.

Chicago Style (17th ed.) Citation

Williams, W., and Geo Bonnor. First Principles of Geography. 1798.

MLA (9th ed.) Citation

Williams, W., and Geo Bonnor. First Principles of Geography. 1798.

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