1. Gilchrist, T. L. 1992.Heterocyclic Chemistry,, 2nd. Ed., 189London: Longman.
2. Bean, G. P. 1990.In Pyrroles, Edited by: Jones, A. R. 105New York: Wiley. part 1
3. A Versatile Synthesis of 3-Phenylsulfonylpyrroles from α-Amino Acids
4. Recent Synthetic Methods for Pyrroles and Pyrrolenines (2H- or 3H-Pyrroles)
5. Sundberg, R. J. 1984.In Comprehensive Heterocyclic Chemistry, Edited by: Katritzky, A. R. and Rees, C. W. Vol. 4, 1–529. New York: Pergamon.