1. MeyersF. H., JawetzE., and GoldfienA.: Review of Medical Pharmacology, 2nd edition, Lange Medical Publications, Los Altos, California, pp. 473–474, 1970.
2. OsolA., PrattR., and AltschuleM. D.: The United States Dispensatory and Physicians' Pharmacology, 26th Ed. J. B. Lippincott Co., Philadelphia, pp. 128–129, 1967.