Gillen,Terry. (1997). Positive influencing skills. Jaico.
Chicago Style aipamenaGillen,Terry. Positive Influencing Skills. Bombay: Jaico, 1997.
MLA aipamenaGillen,Terry. Positive Influencing Skills. Jaico, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.