APA (7th ed.) Citation

Clay, H., & Agger, E. E. (1918). Economics: An introduction for the general reader. Macmillan.

Chicago Style (17th ed.) Citation

Clay, Henry, and Eugene Ewald Agger. Economics: An Introduction for the General Reader. New York: Macmillan, 1918.

MLA (9th ed.) Citation

Clay, Henry, and Eugene Ewald Agger. Economics: An Introduction for the General Reader. Macmillan, 1918.