1. Heftmann, E., “Steroid Biochemistry,” Academic Press, New York, 1970.
2. Heftmann, E., in “Phytochemistry,” Edited by L.P. Miller, Van Nostrand Reinhold, New York, 1973.
3. “Modern Methods of Steroid Analysis,” Edited by E. Heftmann, Academic Press, New York, 1973.
4. Heftmann, E., “Chromatography of Steroids,” Elsevier, Amsterdam, The Netherlands, 1976.
5. Heftmann, E., Lipids 6:128 (1971).