1. A. C. Aitken, Determinants and Matrices, 9th ed., Interscience Pub., New York, 1956.
2. Tom M. Apostol, Calculus, vol. 2, 2nd ed., Blaisdell, Waltham, Mass., 1969.
3. William Snow Burnside and Arthur William Panton, The Theory of Equations, vol. 2, Dover, New York, 1960.
4. Samuel Goldberg, Introduction to Difference Equations, Wiley, New York, 1967.
5. Kenneth Hoffman and Ray Kunze, Linear Algebra, Prentice-Hall, Englewood Cliffs, N.J., 1961.