1. R. E. Buchanan and N. E. Gibbons, “Bergey’s Manual of Determinative Bacteriology,” 8th edition, The Williams & Wilkins Co., Baltimore, 1973, pp. 219.
2. Y. Makino and E. Koizumi, “Rinsho Kagaku Bunseki,” II, Tokyo Kagaku Dojin Co., Tokyo, 1975, pp. 18.