L.Olson David. (2005). Managerial Issues of Enterprise Resource Planning Systems (In lần thứ 1.). American: MC Graw Hill.
Styl cytowania ChicagoL.Olson David. Managerial Issues of Enterprise Resource Planning Systems. In lần thứ 1. American: MC Graw Hill, 2005.
Styl cytowania MLAL.Olson David. Managerial Issues of Enterprise Resource Planning Systems. In lần thứ 1. American: MC Graw Hill, 2005.
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