Cohen, W. A. (1981). How to sell to the government: A step-by-step guide to success. John Wiley and Sons.
Čikaški stil citiranja (17. izdanje)Cohen, William A. How to Sell to the Government: A Step-by-step Guide to Success. John Wiley and Sons, 1981.
MLA način citiranja (9. izdanje)Cohen, William A. How to Sell to the Government: A Step-by-step Guide to Success. John Wiley and Sons, 1981.
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