Matthew Crawford, p161, Shop Class as Soulcraft
- knowing how; personal skill, practised, tacit understanding
- knowing that; information spouted from anyone, anywhere
George Sturt, as discussed by C. Fraying, p35, On Craftsmanship
Jerome Ravetz, as discussed by C. Frayling, p46, On Craftsmanship
Robert Ornstein, as discussed by C. Frayling, p70, On Craftsmanship
