Cita APA (7a ed.)

Frazier, L. M. (1998). North Star: Focus on listening and speaking (Basic). Pearson Education.

Cita Chicago Style (17a ed.)

Frazier, Laurie; Mills. North Star: Focus on Listening and Speaking (Basic). New York, Estados Unidos: Pearson Education, 1998.

Cita MLA (9a ed.)

Frazier, Laurie; Mills. North Star: Focus on Listening and Speaking (Basic). Pearson Education, 1998.