Παραπομπή APA

Gillen, T. (1997). Positive influencing skill. Jaico.

Παραπομπή Chicago Style

Gillen, Terry. Positive Influencing Skill. Bombay: Jaico, 1997.

Παραπομπή MLA

Gillen, Terry. Positive Influencing Skill. Jaico, 1997.