Cita APA

 Merdinger, P. (2009).  Northstar 1: Listening and Speaking.  Pearson Education.

Chicago Style Citation

 Merdinger, Polly.  Northstar 1: Listening and Speaking.  Pearson Education, 2009.

Cita MLA

 Merdinger, Polly.  Northstar 1: Listening and Speaking.  Pearson Education, 2009.

Atenció: Aquestes cites poden no estar 100% correctes.