1. W. Carruthers , Cycloaddition reactions in organic synthesis , Pergamon , Oxford , 1990
2. Cycloaddition reactions in organic synthesis , ed. S. Kobayashi and K. A. Jorgensen , Wiley-VCH , New York , 2002
3. Handbook of cyclization reactions , ed. S.-M. Ma , Wiley-VCH , New York , 2010
4. Methods and applications of cycloaddition reactions in organic syntheses , ed. N. Nishiwaki , John Wiley & Sons , New York , 2014
5. Analysis of the Structural Diversity, Substitution Patterns, and Frequency of Nitrogen Heterocycles among U.S. FDA Approved Pharmaceuticals