1. Bondy, J.A. and Murty, U.S.R. (1976) Graph Theory with Applications. North-Holland.
2. Behzad, M. (1965) Graphs and Their Chromatic Numbers. PhD Thesis, Michigan State University.
3. Vizing, V.G. (1968) Some Unsolved Problems in Graph Theory. Uspekhi Matematicheskikh Nauk, 23, 117-134. (In Russian)
4. On the total coloring of certain graphs
5. On Total Chromatic Number of a Graph