[1] The fullest account of the modern studies on individual differences is to be found in: William Stern: Die differentielle Psychologie in ihren methodischen Grundlagen. (Leipzig, 1911.)
[2] The practical applications of psychology in education, law, and medicine, I have discussed in detail in the books: Münsterberg: Psychology and the Teacher. (New York, 1910.) Münsterberg: On the Witness Stand. (New York, 1908.) (English edition under the title: Psychology and Crime.) Münsterberg: Psychotherapy (New York, 1909.)
[3] Frank Parsons: Choosing a Vocation. (Boston, 1909.)
[4] M. Bloomfield: The Vocational Guidance of Youth. (Boston, 1911.)
[5] Vocations for Boys. (Issued by the Vocation Bureau of Boston. 1912.) Vocations for Boston Girls. (Issued by the Girls' Trade Education League. 1911.) Bulletins of Vocation Series. (Issued by the Women's Educational and Industrial Union. 1911.)
[6] F.W. Taylor: The Principles of Scientific Management. (New York, 1911.) H.L. Gantt: Work, Wages, and Profits. (New York, 1912.) And the books of Emerson, Gilbreth, Goldmark, etc., to be mentioned later.
[7] H. Emerson: Efficiency as a Basis for Operation and Wages. (New York, 1912, p. 107.)
[8] H. Emerson: The Twelve Principles of Efficiency. (New York, 1912, p. 176.)
[9] H Emerson: The Twelve Principles, p. 156.
[10] H. Emerson: The Twelve Principles, p. 177.