Tull, D. S. A. (1988). Research for Marketing Decisions Green, Paul E. International Book House Pvt. Ltd.
Cita Chicago (17th ed.)Tull, Donalds S; Albaum. Research for Marketing Decisions Green, Paul E. New Delhi: International Book House Pvt. Ltd, 1988.
Cita MLA (9th ed.)Tull, Donalds S; Albaum. Research for Marketing Decisions Green, Paul E. International Book House Pvt. Ltd, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.