Bernthal, Paul R., et al. ASTD Competency Study: Mapping the Future. ASTD Press, 2004.
Biech, Elaine and Jennifer Naughton. "12 Habits of Successful Trainers." Infoline. ASTD Press, 2005.
Russo, Cat Sharpe (editor). Early Bird Guide to ASTD Professional Certification. ASTD Press, 2005.
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