Marx on Economics.

MLA

Freedman, Robert, and Harry Schwartz. Marx On Economics. Harmondsworth: Penguin Books, 1961.

APA

Freedman, R., & Schwartz, H. (1961). Marx on Economics. Harmondsworth: Penguin Books.

Chicago

Freedman, Robert, and Harry Schwartz. Marx On Economics. Harmondsworth: Penguin Books, 1961.