Lua APA (7ú heag.)

FERBER ROBERT EDT. (1974). HANDBOOK OF MARKETING RESEARCH. MCGRAW-HILL.

Lua i Stíl Chicago (17ú heag.)

FERBER ROBERT EDT. HANDBOOK OF MARKETING RESEARCH. NEW YORK: MCGRAW-HILL, 1974.

Lua MLA (9ú heag.)

FERBER ROBERT EDT. HANDBOOK OF MARKETING RESEARCH. MCGRAW-HILL, 1974.

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