APA (7th ed.) Citation

Schmidt, N. (1930). Ibn Khaldun: Historian, sociologist and philosopher. Columbia University press.

Chicago Style (17th ed.) Citation

Schmidt, Nathaniel. Ibn Khaldun: Historian, Sociologist and Philosopher. New York: Columbia University press, 1930.

MLA (9th ed.) Citation

Schmidt, Nathaniel. Ibn Khaldun: Historian, Sociologist and Philosopher. Columbia University press, 1930.