APA

Gallagher (Nancy), . (2006). Dettas Key to the Next Generation TOEFL Test: Advanced Skill Practice (10 CDs). : .

Chicago

Gallagher (Nancy), . 2006. Dettas Key to the Next Generation TOEFL Test: Advanced Skill Practice (10 CDs). : .

Harvard

Gallagher (Nancy), . (2006). Dettas Key to the Next Generation TOEFL Test: Advanced Skill Practice (10 CDs). : .

MLA

Gallagher (Nancy), . Dettas Key to the Next Generation TOEFL Test: Advanced Skill Practice (10 CDs). : . 2006.