The Mathematics of Finite Networks: An Introduction to Operator Graph Theory

Introduction to the Theory of Groups of Finite Order: Robert D Carmichael

Introduction to Discrete Mathematics: An Finite and Mathematics 1 by Used 2

An introduction to the theory of groups of finite order by Harol [Leather Bound]

An Introduction to the Theory of Groups of Finite Order by Harold Hilton

Introduction to Finite Mathematics Kemeny Snell Thompson 1957 Prentice-Hall

Finite Element Solution of Boundary Value Problems by O. Axelsson & V.A. Barker

Gems of Combinatorial Optimization and Graph Algorithms by Andreas S. Schulz