Gaya APA

Bell, J., Waters, S. (2014). Doing your research project : a guide for firs-time researchers (6th. ed.). Maidenhead Berkshire: Mc Graw Hill Education.

Gaya MLA

Bell, Judith., Waters, Stephen. "Doing your research project : a guide for firs-time researchers". 6th. ed. Maidenhead Berkshire: Mc Graw Hill Education, 2014. Text.