Lua APA (7ú heag.)

BLACK SAM. (1993). PRACTICAL PUBLIC RELATIONS (4.). UNIVERSAL BOOKS.

Lua i Stíl Chicago (17ú heag.)

BLACK SAM. PRACTICAL PUBLIC RELATIONS. 4. NEW DELHI: UNIVERSAL BOOKS, 1993.

Lua MLA (9ú heag.)

BLACK SAM. PRACTICAL PUBLIC RELATIONS. 4. UNIVERSAL BOOKS, 1993.

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