1. Heftmann, E., Lipids 6:128 (1971).
2. Heftmann, E., Editor, “Modern Methods of Steroid Analysis,” Academic Press, New York, N.Y., 1973.
3. Heftmann, E., in “Chromatography,” Third Edition, Edited by E. Heftmann Van Nostrand Reinhold, New York, N.Y., 1974, chapter 19.
4. Heftmann, E., “Steroid Biochemistry,” Academic Press, New York, N.Y., 1970.
5. Heftmann, E., in “Phytochemistry,” Edited by L.P. Miller, Van Nostrand Reinhold, New York, N.Y., 1973.