A Mathematical Theory of Systems Engineering: The Elements
Wymore, A. W. 1977. A Mathematical Theory of Systems Engineering: The Elements. Huntington, NY, USA: Robert E. Krieger.
This source is considered a primary reference for the Systems Engineering: Historic and Future Challenges article.
A review of the original version of this book (published in 1967) can be found in:
Arbib, M. "Book Reviews." IEEE Transactions on Automatic Control. 15(3), p. 407-408. June 1970.