
REFERENCES

John Riordan: Introduction to combinatorics New York, unabridged republication of the edition published by John Wiley & Sons, New York, 1958, ISBN 0486425363.
Percy A. MacMahon: Combinatorial Analysis, Volumes I, II bound in one volume, Chelsea Publishing Company, New York, 1960, Reprint of the two volumes published 1915, 1916 by Cambridge University Press, Library of Congress Catalog Card No. 5910267.
