Cita APA (7th ed.)

BEER MICHAEL. (1988). JOY OF SELLING. MERCURY BOOKS.

Cita Chicago (17th ed.)

BEER MICHAEL. JOY OF SELLING. LONDON: MERCURY BOOKS, 1988.

Cita MLA (9th ed.)

BEER MICHAEL. JOY OF SELLING. MERCURY BOOKS, 1988.