Maynard, H. H., Davis, J. H., & Helen, H. C. (1957). Sales management. Ronald Press.
Lua i Stíl Chicago (17ú heag.)Maynard, Harold Howard, James Henry Davis, agus Hernan Christian Helen. Sales Management. New York: Ronald Press, 1957.
Lua MLA (9ú heag.)Maynard, Harold Howard, et al. Sales Management. Ronald Press, 1957.
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