Não informado. (1968). Educational Marketer. Simba - Communication Trends.
Lua i Stíl Chicago (17ú heag.)Não informado. Educational Marketer. Wilton, Conn: Simba - Communication Trends, 1968.
Lua MLA (8ú heag.)Não informado. Educational Marketer. Simba - Communication Trends, 1968.
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