Cita APA (7th ed.)

FORSYTH PATRICK. (2004). MARKETING & SELLING PROFESSIONAL SERVICES (3RD.). KOGAN PAGE.

Cita Chicago (17th ed.)

FORSYTH PATRICK. MARKETING & SELLING PROFESSIONAL SERVICES. 3RD. LONDON: KOGAN PAGE, 2004.

Cita MLA (9th ed.)

FORSYTH PATRICK. MARKETING & SELLING PROFESSIONAL SERVICES. 3RD. KOGAN PAGE, 2004.