Schiffman\'s, S. (1992). Stephan Schiffman's telemarketing. Bob Adams.
Lua i Stíl Chicago (17ú heag.)Schiffman\'s, Stephan. Stephan Schiffman's Telemarketing. Bob Adams, 1992.
Lua MLA (8ú heag.)Schiffman\'s, Stephan. Stephan Schiffman's Telemarketing. Bob Adams, 1992.
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