Plossl, G. (1995). Orlicky`s material requirements planning (2nd.). Mc graw hill.
Lua i Stíl Chicago (17ú heag.)Plossl, George. Orlicky`s Material Requirements Planning. 2nd. New york: Mc graw hill, 1995.
Lua MLA (9ú heag.)Plossl, George. Orlicky`s Material Requirements Planning. 2nd. Mc graw hill, 1995.
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