Style de citation APA

(1987). Practice and reinforcement: (Purple level). New York: McDougal, Littell & Companay.

Style de citation Chicago

Practice and Reinforcement: (Purple Level). New York: McDougal, Littell & Companay, 1987.

Style de citation MLA

Practice and Reinforcement: (Purple Level). New York: McDougal, Littell & Companay, 1987.

Attention : ces citations peuvent ne pas être correctes à 100%.