Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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