Cita APA (7th ed.)

DUFFY PHILIP G. (1994). BUSINESS TO BUSINESS MARKETING. VISION BOOKS PVT. LTD.

Cita Chicago (17th ed.)

DUFFY PHILIP G. BUSINESS TO BUSINESS MARKETING. NEW DELHI: VISION BOOKS PVT. LTD, 1994.

Cita MLA (9th ed.)

DUFFY PHILIP G. BUSINESS TO BUSINESS MARKETING. VISION BOOKS PVT. LTD, 1994.