Grimshaw, N. (1970). The angry valley. Longman.
Cita Chicago (17th ed.)Grimshaw, Nigel. The Angry Valley. London: Longman, 1970.
Cita MLA (9th ed.)Grimshaw, Nigel. The Angry Valley. Longman, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.