1. V. Prelog, Why Natural Products? Croatica Chemica Acta, 1985, 58, 349–351.
2. R. B. Woodward, M. P. Cava, W. D. Ollis, A. Hunger, H. U. Daeniker, and K. Schenker, The Total Synthesis of Strychnine, Tetrahedron, 1963, 19, 247-288; pertinent p. 248.
3. Comment by W. E. Doering in the article by K. C. Nicolaou and Scott A. Snyder, Chasing Molecules That Were Never There, Misassigned Natural Products and the Role of Chemical Synthesis in Modern Structure Elucidation, Angew. Chem. Int. Ed., 2005, 44, 1012-1049.
4. K. C Nicolaou, Christopher R. H. Hale, Christian Nilewski, and Herakidia A. Ioannidou, Constructing Molecular Complexity and Diversity. Total Synthesis of Natural Products of Biological and Medicinal Importance, Chem. Soc. Rev. 2012, 41, 5185-5238.
5. E. J. Corey, Foreword in Creativity in Organic Synthesis Vol. I by J. S. Bindra and Ranjna Bindra, Academic Press, New York, 1975