Phelps, D. M. 1. Planning the product.
Lua i Stíl Chicago (17ú heag.)Phelps, Dudley Maynard 1897. Planning the Product. Chicago, R. D. Irwin, 1947.
Lua MLA (9ú heag.)Phelps, Dudley Maynard 1897. Planning the Product.
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