Rosen, Kenneth H. Discrete mathematics and its applications : with combinatorics and graph theory / - 7th ed. - Chennai : McGraw-Hill, c2017. - xxviii, 843/ I-25 p. : ill. ; 24 cm. Includes index. ISBN: 9780070681880 LC Class. No.: 21599-21606 Dewey Class. No.: 511 / ROS