Cita APA (7a ed.)

Rackham, N.. (1988). SPIN selling. McGraw-Hill.

Cita Chicago Style (17a ed.)

Rackham, Neil. SPIN Selling. New York: McGraw-Hill, 1988.

Cita MLA (9a ed.)

Rackham, Neil. SPIN Selling. McGraw-Hill, 1988.