APA (7th ed.) Zitazioa

Betta, L., & DuPaquier Sardinas, C. (1998). NorthStar: Focus on reading and writing, intermediate. Longman.

Chicago Style (17th ed.) Zitazioa

Betta, Laurie, eta Carolyn DuPaquier Sardinas. NorthStar: Focus on Reading and Writing, Intermediate. Nueva York: Longman, 1998.

MLA (9th ed.) Zitazioa

Betta, Laurie, eta Carolyn DuPaquier Sardinas. NorthStar: Focus on Reading and Writing, Intermediate. Longman, 1998.