Sperling. JoAnn. (1969). Job descriptions in marketing management. AMA, Inc.
Lua i Stíl Chicago (17ú heag.)Sperling. JoAnn. Job Descriptions in Marketing Management. New York: AMA, Inc, 1969.
Lua MLA (9ú heag.)Sperling. JoAnn. Job Descriptions in Marketing Management. AMA, Inc, 1969.
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