Cita APA (7a ed.)

Hanna, N., & Wagle, J. S. (1989). Who is your satisfied customer? [s.n.].

Cita Chicago Style (17a ed.)

Hanna, Nessim, y John S. Wagle. Who Is Your Satisfied Customer? [S.l.]: [s.n.], 1989.

Cita MLA (9a ed.)

Hanna, Nessim, y John S. Wagle. Who Is Your Satisfied Customer? [s.n.], 1989.