Phelps, D. M. 1. Planning the product.
Cita Chicago (17th ed.)Phelps, Dudley Maynard 1897. Planning the Product. Chicago, R. D. Irwin, 1947.
Cita MLA (9th ed.)Phelps, Dudley Maynard 1897. Planning the Product.
Atenció: Aquestes cites poden no estar 100% correctes.