Bard, R. (1987). The Trainer's professional development handbook. Jossey-Bass.
Cita Chicago (17th ed.)Bard, Ray. The Trainer's Professional Development Handbook. San Francisco, California: Jossey-Bass, 1987.
Cita MLA (9th ed.)Bard, Ray. The Trainer's Professional Development Handbook. Jossey-Bass, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.