Whiting, P. H. (1957). 5 great rules of selling (rev ed.). McGraw-Hill.
Čikaški stil citiranjaWhiting, Percy H. 5 Great Rules of Selling. rev ed. New York: McGraw-Hill, 1957.
MLA način citiranjaWhiting, Percy H. 5 Great Rules of Selling. rev ed. McGraw-Hill, 1957.
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