Lua APA (7ú heag.)

RUSSELL F A. (1978). TEXTBOOK OF SALESMANSHIP (10TH.). MCGRAW-HILL.

Lua i Stíl Chicago (17ú heag.)

RUSSELL F A. TEXTBOOK OF SALESMANSHIP. 10TH. TOKYO: MCGRAW-HILL, 1978.

Lua MLA (9ú heag.)

RUSSELL F A. TEXTBOOK OF SALESMANSHIP. 10TH. MCGRAW-HILL, 1978.

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