Bard, R. (1987). The trainer's professional development handbook. Jossey - Bass.
Chicago-čujuhus (17. p.)Bard, Ray. The Trainer's Professional Development Handbook. san Fransisco: Jossey - Bass, 1987.
MLA-čujuhus (9. p.)Bard, Ray. The Trainer's Professional Development Handbook. Jossey - Bass, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.