Imbert, Etudes experimentales de travail professionnel ouvrier, Sur la fatigue engendree par les mouvements rapides.

William James, Psychology, Briefer Course, p. 134.

Ibid., p. 138. William James, Psychology, Advanced Course. p. 112.

F.B. Gilbreth, Bricklaying System, p. 142.

Stratton, Experimental Psychology and Culture, p. 214.

Prof. Bain, quoted In William James' Psychology, Briefer Course, pp. 145-147.

F.B. Gilbreth, Bricklaying System, para. 18-19.

M.W. Calkins, A First Book in Psychology, p. 354.

James Sully, The Teacher's Handbook of Psychology, p. 119.

Stratton, Experimental Psychology and Culture, p. 99.

Stratton, Experimental Psychology and Culture p. 240.

Attracting the attention is largely a matter of appealing to what is known to interest, for example, to a known ambition.

M.S. Read, An Introductory Psychology, p. 183.

F.B. Gilbreth, Motion Study, p. 89.

Ibid., </>Bricklaying System, para. 555-557.