Zdroj: [Plháková, Alena, Dějiny psychologie, Grada, 1, 2006, 80-247-0871-X, 39]
David Hartley citáty a výroky
David Hartley: Citáty anglicky
On animals. Observations on Man https://archive.org/stream/cu31924029011902#page/n5/mode/2up (1749; 6th edition, 1834), Part I, Chapter III, Section VII.
Observations on Man (1749; 6th edition, 1834), Part II, Chapter III, Section II.