APA (7th ed.) Citation

(1989). Early 20th century (1. publ.). Watts.

Chicago Style (17th ed.) Citation

Early 20th Century. 1. publ. London [u.a.]: Watts, 1989.

MLA (9th ed.) Citation

Early 20th Century. 1. publ. Watts, 1989.

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