Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - Ì.: ÈÈË, 1949. - pp. 517
Franzosini P., Sanesi M. Thermodynamic and transport properties of organic salts. - IUPAC Chemical Data Series, No. 28. - Pergamon Press, 1980. - pp. 73