Organic Chemistry, 1st Edition, J. Clayden, N. Greeves, S. Warren and P. Wothers,
Oxford University Press. Mainly Chapter 44 (Chapters 29 and 30 in 2nd ed.).
Aromatic Heterocyclic Chemistry, D. T. Davies, (Oxford Primer No. 2): (QD 400 D2)
useful in parts More advanced texts: Heterocyclic Chemistry, 2nd Ed., T. L. Gilchrist and
Heterocyclic Chemistry, 3
rd Ed., J. A. Joules, K. Mills and G. F. Smith (QD 400 J8)