1. Lillie R. D., Histologic Technic and Practical Histochemistry (McGraw-Hill Book Co., Inc., New York, 1954), Chap. 3, p. 29 and Chap. 12, p. 243.
2. Thompson S. W., Selected Histochemical and Histopathological Methods (Charles C Thomas, Springfield, Illinois, 1966), pp. 589–592.
3. Pearse A. G. E., Histochemistry Theoretical and Applied (Little Brown and Co., Boston, Mass., 1960), 2nd ed., pp. 694–695.
4. Spectrochemical Determination of Beryllium