APA ציטוט

(1989). Practice and reinforcement: (Blue level). New York: Mc Dougal, Littell & Company.

Trích dẫn kiểu Chicago

Practice and Reinforcement: (Blue Level). New York: Mc Dougal, Littell & Company, 1989.

ציטוט MLA

Practice and Reinforcement: (Blue Level). New York: Mc Dougal, Littell & Company, 1989.