Cita APA

Beatty, K., Hopkins, A., & Potter, J. (2007). Secret Codes. England: Pearson Education Ltd.

Chicago Style Citation

Beatty, Ken, Andy Hopkins, i Jocelyn Potter. Secret Codes. England: Pearson Education Ltd, 2007.

Cita MLA

Beatty, Ken, Andy Hopkins, i Jocelyn Potter. Secret Codes. England: Pearson Education Ltd, 2007.

Atenció: Aquestes cites poden no estar 100% correctes.