1. B. A. Porai-Koshits, Azo Dyes [in Russian], Khimiya, Leningrad (1972).
2. H. Zollinger, Azo and Diazo Chemistry [Russian translation], GKhI, Leningrad (1956).
3. I. M. Kogan, The Chemistry of Dyes [in Russian], GKhI, Moscow (1956).
4. K. Venkataraman, The Chemistry of Synthetic Dyes [Russian translation], Vol. III, Khimiya, Leningrad (1974).
5. B. I. Stepanov, Introduction to the Chemistry and Technology of Organic Dyes [in Russian], Khimiya, Moscow (1977).