Gaya APA

Kellar, Robert E.. (1997). Sales negotiation skills that sell . New York: Amacom.

Gaya Chicago

Kellar, Robert E.. Sales negotiation skills that sell. New York: Amacom, 1997. Text.

Gaya MLA

Kellar, Robert E.. Sales negotiation skills that sell. New York: Amacom, 1997. Text.

Gaya Turabian

Kellar, Robert E.. Sales negotiation skills that sell. New York: Amacom, 1997. Print.