Sheth, J. &. S. (2013). The 4 A's of marketing. Routledge.
Lua i Stíl Chicago (17ú heag.)Sheth, Jagdish & Sisadia. The 4 A's of Marketing. New York: Routledge, 2013.
Lua MLA (9ú heag.)Sheth, Jagdish & Sisadia. The 4 A's of Marketing. Routledge, 2013.
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