1. For a survey of pyrrole chemistry see: [1a] in Houben-Weyl, Methoden der Organischen Chemie (Ed.: ), Thieme Verlag, Stuttgart, 1994, vol. E 6a, Part 1, p. 556–798.
2. in Comprehensive Heterocyclic Chemistry (Eds.: ), Pergamon Press, Oxford, 1984, vol. 4, Part 3, p. 313–442.
3. 1c Die Chemie der Pyrrole, Springer-Verlag, Berlin, 1974, p. 189–255.
4. For the biosynthesis of porphyrins and related macrocycles see: [2a] in Porphyrins and Metalloporphyrins (Ed.: ), Elsevier Scientific Publishing Company, New York, 1975, chapter 3.
5. in Comprehensive Heterocyclic Chemistry (Eds.: ), Pergamon Press, Oxford, 1984, vol. 1, Part 1, p. 99–109.