Basic techniques of combinatorial theory

Classical Topology and Combinatorial Group Theory by John Stillwell

Combinatorial Group Theory: Presentations of Groups in Terms of Generators a...

Combinatorial Group Theory Contemporary Mathematics, 109 Tang, Francis C. Y., Be

A Survey of Combinatorial Theory; Srivastava, Jagdish N.:

Two-Dimensional Homotopy and Combinatorial Group Theory (London Mathematical So

Cooperative Games on Combinatorial Structures. Theory and Decision Library C, Ba

Variable Dimension Complexes, Vol. 1: Basic Theory (Classic Reprint)