APA (7th ed.) Citation

Llewellyn, R. (1939). How green was my valley / by R. Llewellyn. Michael Joseph.

Chicago Style (17th ed.) Citation

Llewellyn, R. How Green Was My Valley / by R. Llewellyn. Michael Joseph, 1939.

MLA (9th ed.) Citation

Llewellyn, R. How Green Was My Valley / by R. Llewellyn. Michael Joseph, 1939.

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