Citazione Stile APA (7a Edizione)

Gallagher, N. Delta's next generation toefel test. Delta publishing company.

Citazione stile Chigago Style (17a edizione)

Gallagher, Nancy. Delta's Next Generation Toefel Test. New York: Delta publishing company.

Citatione MLA (9a ed.)

Gallagher, Nancy. Delta's Next Generation Toefel Test. Delta publishing company.