"Modern Graph Theory" by Béla Bollobás is a comprehensive textbook on graph theory, a branch of mathematics that deals with the study of graphs, which are collections of vertices connected by edges. The book was first published in 1998 and has since become a standard reference in the field.
I highly recommend "Modern Graph Theory" by Béla Bollobás to anyone interested in learning about graph theory, including graduate students, researchers, and mathematicians.
Also, I can try to find a pdf version of the book, but I have to warn you that it might be against the copyright law.
Bollobás, B. (1998). Modern graph theory. Springer.