Cita APA (7th ed.)

BELL CHIP R. (1991). AT YOUR SERVICE: TRAINERS KIT+6. QUALITY RESOURCES.

Cita Chicago (17th ed.)

BELL CHIP R. AT YOUR SERVICE: TRAINERS KIT+6. NEW YORK: QUALITY RESOURCES, 1991.

Cita MLA (9th ed.)

BELL CHIP R. AT YOUR SERVICE: TRAINERS KIT+6. QUALITY RESOURCES, 1991.