1. World population growth and related technical problems
2. N. T. J. Bailey, The Mathematical Approach to Biology and Medicine, Wiley, New York, 1967, Chapter 1.
3. R. Bellman and K. L. Cooke, Modern Elementary Differential Equations, second ed., Addison-Wesley, Reading, 1971, especially Chapter 1.
4. Some Socially Relevant Applications of Elementary Calculus