Devries, H. (1992). Self marketing secrets. India Book Distributors.
Cita Chicago (17th ed.)Devries, Henry. Self Marketing Secrets. Bombay: India Book Distributors, 1992.
Cita MLA (9th ed.)Devries, Henry. Self Marketing Secrets. India Book Distributors, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.