Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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