Llewellyn, R. (1940). How Green was my Valley. Pocket books.
Cita Chicago Style (17a ed.)Llewellyn, Richard. How Green Was My Valley. New York: Pocket books, 1940.
Cita MLA (9a ed.)Llewellyn, Richard. How Green Was My Valley. Pocket books, 1940.
Precaución: Estas citas no son 100% exactas.