1. Bondy, J.A.and Murty, U.S.R., Graph theory with applications, London : MacMillan, 1976.
2. West, Douglas B., Introduction to graph theory, Second edition, Prentice-Hall of India Private Limited, New Delhi, 2006.
3. Harary, Frank, Hedetniemi, Stephen and Prins, Geert, An interpolation theorem for graphical Homomorphisms, Portugaliae Mathematica, 26-Fasc.4 (1967), 453-462.
4. Jonathan Gross and Jay Yellen, Hand book of Graph theory, CRC Press, New York, 2004.
5. Mohanapriya, N.,Vernold, Vivin J., Venkatachalam, M., On Dynamic coloring of Fan graphs, International Journal of Pure and Applied Mathematics, Volume 106, No. 8 (2016), 169-174.