APA (7th ed.) Citation

Piaget, J. (1973). Main trends in psychology / (by) Jean Piaget. Allen and Unwin.

Chicago Style (17th ed.) Citation

Piaget, Jean. Main Trends in Psychology / (by) Jean Piaget. London: Allen and Unwin, 1973.

MLA (9th ed.) Citation

Piaget, Jean. Main Trends in Psychology / (by) Jean Piaget. Allen and Unwin, 1973.

Warning: These citations may not always be 100% accurate.