APA (7th ed.) Citation

(1956). In their early twenties. A study of Glasgow youth. London etc..

Chicago Style (17th ed.) Citation

In Their Early Twenties. A Study of Glasgow Youth. London etc., 1956.

MLA (8th ed.) Citation

In Their Early Twenties. A Study of Glasgow Youth. London etc., 1956.

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