1. Cordell, G. A. 1974. The biosynthesis of indole alkaloids. Lloydia 37:219–298.
2. Specialist Periodical Reports, Biosynthesis;E Leete,1977
3. Coscia, C. J., L. Botta and R. Guarnaccia. 1970. Monoterpene biosynthesis III. On the mechanism of iridoid and secoiridoid monoterpene biosynthesis. Arch. Biochem. Biophys. 136:498–506.
4. Battersby, A. R., S. H. Brown and T. G. Payne. 1970. Biosynthesis of loganin and the indole alkaloids from hydroxygeraniol-hydroxynerol. J. Chem. Soc., Chem. Commun. 827–828.
5. Escher, S., P. Loew and D. Arigoni. 1970. The role of hydroxygeraniol and hydroxynerol in the biosynthesis of loganin and indole alkaloids. J. Chem. Soc, Chem. Commun. 823–826.