1. Anderson T. Transactions of the Royal Society Edinburgh. 1849;16(123):463
2. Korner GG. Science National Economic Palermo. 1869:5. reprinted in Calm, A. and Buchka, K. v. Die Chemie des Pyridins und seiner Derivate, Braunschweig, 1889-1891, which contains an excellent account of the early history of these bases
3. Scriven EFV. In: Katritzky AR, Rees CW, editors. Comprehensive Heterocyclic Chemistry I. Oxford: Pergamon; 1984. 2, 165, 216, 220
4. Comins DL, Joseph SP. In: Katritsky AR, Rees CW, Scriven EFV, editors. Comprehensive Heterocyclic Chemistry II. Elsevier, Oxford; 1996. 5, 37, 41, 68, 76, 78, 80, 82, 98
5. Joule JA, Mills K. Heterocyclic Chemistry. 5th ed. West Sussex: Blackwell; 2010