APA

Brennan C. D., . (1994). Sales questions that close the sale: how to uncover your customers' real needs. New York: Amacom.

Chicago

Brennan Charles D, . 1994. Sales questions that close the sale: how to uncover your customers' real needs. New York: Amacom.

Harvard

Brennan C. D., . (1994). Sales questions that close the sale: how to uncover your customers' real needs. New York: Amacom.

MLA

Brennan Charles D, . Sales questions that close the sale: how to uncover your customers' real needs. New York: Amacom. 1994.