APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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