Cartmell E., Fowles G. W. A., . (1977). Valency and molecular structure. London: Butterworths.
Cartmell E, Fowles G W A, . 1977. Valency and molecular structure. London: Butterworths.
Cartmell E, Fowles G W A, . Valency and molecular structure. London: Butterworths. 1977.