Cita APA (7th ed.)

Steck-Vaughn School Supply. (2004). E S L building english proficiency. Steck-Vaughn Company.

Cita Chicago (17th ed.)

Steck-Vaughn School Supply. E S L Building English Proficiency. Nueva York: Steck-Vaughn Company, 2004.

Cita MLA (9th ed.)

Steck-Vaughn School Supply. E S L Building English Proficiency. Steck-Vaughn Company, 2004.