1. Conn H. J., Darrow M. A., Emmel V. M. Staining Procedures, 2nd ed. The Williams & Wilkins Co., Baltimore 1960; 94–6
2. Emmel V. M., Cowdry E. V. Laboratory Techniques in Biology and Medicine, 4th ed. The Williams & Wilkins Co., Baltimore 1964; 318
3. A Method for the Combined Staining of Cells and Fibers in the Nervous System
4. Lillie R. D. Histopathologic Technic and Practical Histochemistry, 3rded. McGraw-Hill Book Co., New York 1965; 487–92