Lua APA (7ú heag.)

Lesikar, R. V. (1976). BUSINESS COMMUNICATION (3rd.). RICHARD D. IRWIN ILLINUIS.

Lua i Stíl Chicago (17ú heag.)

Lesikar, Raymond V. BUSINESS COMMUNICATION. 3rd. Null: RICHARD D. IRWIN ILLINUIS, 1976.

Lua MLA (9ú heag.)

Lesikar, Raymond V. BUSINESS COMMUNICATION. 3rd. RICHARD D. IRWIN ILLINUIS, 1976.

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