Cohen, D. I. A. (1978). Basic techniques of combinatorial theory. Wiley.
Cita Chicago (17th ed.)Cohen, Daniel I. A. Basic Techniques of Combinatorial Theory. New York: Wiley, 1978.
Cita MLA (9th ed.)Cohen, Daniel I. A. Basic Techniques of Combinatorial Theory. Wiley, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.