Cita APA

Gallagher, N., & Gallagher, N. (1999). Delta's key to the TOEFL test. McHenry, IL: Delta.

Citación estilo Chicago

Gallagher, Nancy, y Nancy Gallagher. Delta's Key to the TOEFL Test. McHenry, IL: Delta, 1999.

Cita MLA

Gallagher, Nancy, y Nancy Gallagher. Delta's Key to the TOEFL Test. McHenry, IL: Delta, 1999.