Ernst Gail, Stephen Gos, Rupprecht Kulzer, Jürgen Lorösch, Andreas Rubo and Manfred Sauer "Cyano Compounds, Inorganic" Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, Weinheim, 2004. doi10.1002/14356007.a08_159.pub2
Gail, E., Gos, S., Kulzer, R., Lorösch, J., Rubo, A., Sauer, M., Kellens, R., Reddy, J., Steier, N. und Hasenpusch, W (10 de 2011). «Cyano Compounds, Inorganic». Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a08_159.La referencia utiliza el parámetro obsoleto |mes= (ayuda)