End-User Training: An Empirical Study Comparing On-Line Practice Methods. - Susan Wiedenbeck; Patti L. Zila; Daniel S. McConnell (CHI, 1995)

Hands-on Practice in Learning to Use Software: A Comparison of Exercise, Exploration, and Combined Formats. - Susan Wiedenbeck; Patti L. Zila (ACM Trans. Comput. Hum. Interact., 1997)