1. W. E. Hartnett,An Introduction to the Fundamental Concepts of Analysis, Wiley, New York, 1964.
2. W. E. Hartnett,Principles of Modern Mathematics, Book 1, Harper, New York, 1963. Reprinted by Scott, Foresman, Chicago, 1966. W. E. Hartnett,Principles of Modern Mathematics, Book 2, Scott, Foresman, Chicago, 1971.
3. J. Kelley,General Topology, Van Nostrand, Princeton, 1955.
4. H. Fehr,Texts and Teachers Commentaries for Secondary School Mathematics Curriculum Improvement Study, Courses I, II, III; available from Teachers College Press Teachers College, Columbia University, New York.
5. H. B. Griffiths and P. J. Hilton,A Comprehensive Textbook of Classical Mathematics: A Contemporary Interpretation, Van Nostrand Reinhold Company, London, 1970.