Cita APA (7th ed.)
Freedman, R. (1961). Marx on economics. Penguin books.
Cita Chicago (17th ed.)
Freedman, Robert. Marx on Economics. Middlesex,England: Penguin books, 1961.
Cita MLA (9th ed.)
Freedman, Robert. Marx on Economics. Penguin books, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.