Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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