Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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