Cita APA (7th ed.)

English, A. K., & English, L. M. (1998). NorthStar: Focus on reading and writing, high intermediate. Longman.

Cita Chicago (17th ed.)

English, Andrew K., i Laura Monahon English. NorthStar: Focus on Reading and Writing, High Intermediate. Nueva York: Longman, 1998.

Cita MLA (9th ed.)

English, Andrew K., i Laura Monahon English. NorthStar: Focus on Reading and Writing, High Intermediate. Longman, 1998.