Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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