Cita APA (7a ed.)

Walker, J. A. (1991). How the options markets works. New York Institute of Finance.

Cita Chicago Style (17a ed.)

Walker, Joseph A. How the Options Markets Works. New York [etc]: New York Institute of Finance, 1991.

Cita MLA (9a ed.)

Walker, Joseph A. How the Options Markets Works. New York Institute of Finance, 1991.