VRANA, Ivan. How to approach the development of enterprise information system. In Agricultural economics : an international journal = mezinárodní vědecký časopis. - Prague : Institute of Agricultural and Food Information, 2004. ISSN 0139-570X, 2004, vol. 50, no. 1, s. 41-46. Dostupné na : <http://www.agriculturejournals.cz/publicFiles/58687.pdf>