Ward, A. G. (1938). The nature of crystals. Blackie.
Cita Chicago (17th ed.)Ward, A. G. The Nature of Crystals. London: Blackie, 1938.
Cita MLA (8th ed.)Ward, A. G. The Nature of Crystals. Blackie, 1938.
Atenció: Aquestes cites poden no estar 100% correctes.