Le marché détermine la devise, le catalogue et les paiements, sans changer la langue.
English
I. The original nature of man.--II. The psychology of learning.--III. Mental work and fatigue and individual differences and their causes · Part 2 of Vol. III is a revision of a book, Educational psychology, which appeared in 1903, and in a revised form, in 1910 · "Bibliography of references made in the text", at end of each volume
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