Cita APA (7th ed.)

Writing Improvement Project. (1977). Building English skills. McDougal, Littell & Company.

Cita Chicago (17th ed.)

Writing Improvement Project. Building English Skills. Evanston, Illinois: McDougal, Littell & Company, 1977.

Cita MLA (9th ed.)

Writing Improvement Project. Building English Skills. McDougal, Littell & Company, 1977.