APA (7th ed.) Citation

Gras, N. S. B. (1922). An introduction to economic history. Harper & Brothers.

Chicago Style (17th ed.) Citation

Gras, Norman Scott Brien. An Introduction to Economic History. New York, London: Harper & Brothers, 1922.

MLA (9th ed.) Citation

Gras, Norman Scott Brien. An Introduction to Economic History. Harper & Brothers, 1922.