Cita APA (7a ed.)

Gillen, T. (1995). Positive influencing skills. Institute of Personnel and Development.

Cita Chicago Style (17a ed.)

Gillen, Terry. Positive Influencing Skills. London: Institute of Personnel and Development, 1995.

Cita MLA (9a ed.)

Gillen, Terry. Positive Influencing Skills. Institute of Personnel and Development, 1995.