Cita APA (7a ed.)

(1977). Building English Skills. Orange Level. McDougal ; Littell-Company.

Cita Chicago Style (17a ed.)

Building English Skills. Orange Level. Illinois: McDougal ; Littell-Company, 1977.

Cita MLA (8a ed.)

Building English Skills. Orange Level. McDougal ; Littell-Company, 1977.