Burkinshaw, S. M., (1994). In David R. W. and Geoffery, H. editors. The Chemistry and Application of Dyes. Plenum Press. New York and London, 236-331.

Carey, E. A., (2003). Organic Chemistry. New York, PrenticeHall Inc., 462-465.

David, R. W. and Geoffery, H. (1994). The Chemistry and Application of Dyes. Plenum press. New York and London, 115- 231.

Gregory, P., Warring D. R. and Hallos G. (1990). The Chemistry and Application of Dyes. Plenum press. London. 18-20.

Hitoshi, U. (2004). National Textile Center Annual Report. NTC project CO3PH01.Kandil, S. S. (1998) Trans. Met. Chem 23:461-465.

Karci, F.A and Karci, F.I (2008). Synthesis and solvatochromic properties of some novel heterocyclic diazo dyes from barbuturic acid. J. of Dyes and Pigment 77:451-456.

Kazaure, M.A and Abba, H (2002). The effect of substituent on the colour, dyeing and fastness properties of N .N-dimethylamino a zo benzene. J. of Chem. Soc. Nig 27 (1) 28-30.

Kirkan, B. and Gup, R. (2008). Synthesis of new azo dyes and copper (II) complexes derived from Barbituric acid and amono benzoyl hydrazone. Turk J. Chem. 32:17.

Kirk-Othmer, (1992). Chemistry of azo dyes, In Encyclopedia of Chemical Technology. 4th Edition 3, 821-852.

Maradiya, H.R. and Vithal S.P (2001) synthesis and dyeing performance of some disperse azo dyes. J. of Serb Chem. Soc. 12(6)710-714.

Masoud, S. M., Khalil, E.A., Hinderway, B. F., Ali, E. A. and Mohamed, E. F.(2004) Spectroscopic studies on some azo compounds and their cobalt, copper and nickel complexes. Spectrochemica Acta part A 60:2807-2817.

Otutu J. O., Okoro, D. and Ossai E. K. (2008). Synthesis of diazo dyes for o-aminophenol and their fastness properties on synthetic polymer fibres. J. of applied science 8(2): 334-339.

Patel, B. K., Prajapati, N. K. and Patel, D. G. (2013). Synthesis, characterization and spectral studies of chelating azo dyes containing salicylic acid ligand. Pelagia Research Library, Der Chemica Sinica, 4(6); 70-72.

Soliman, E. M. and El- Shababy, M, (1994). Synthesis, Characterization and Electrical conductivity properties of homo and trimetallic complexes of mixed azo dyes. J. of Material Science. 29: 4505-4509.

Tiedemann, E.J. and Yang, Y. (1995). Extraction of natural red dyes from wool using the EDTA/DMF method. JAIC 34(3) 195- 206.

Vankar, P.S. (2000). Chemistry of Natural Dyes. General article. Indian Institute of Technology. New Delhi. 3:73-80 Vogel, A (1979) A textbook of practical organic chemistry. 5th Edition. Longman. Green & co. London 590.