Cita APA (7th ed.)

ROBERTS-PHELPS GRAHAM. (2000). SALES TRAINING GAMES. GOWER.

Cita Chicago (17th ed.)

ROBERTS-PHELPS GRAHAM. SALES TRAINING GAMES. U S A: GOWER, 2000.

Cita MLA (9th ed.)

ROBERTS-PHELPS GRAHAM. SALES TRAINING GAMES. GOWER, 2000.