1. G. L. Lamb, Jr., Introductory Applications of Partial Differential Equations with Emphasis on Wave Propagation and Diffusion (John Wiley and Sons, New York, 1995).
2. Tyn Myint-U., Partial Differential Equations of Mathematical Physics (New York, 1980).
3. Christian Constanda, Solution Techniques for Elementary Partial Differential Equations (New York, 2002).
4. Dean G. Duffy, Transform Methods for Solving Partial Differential Equations (CRC, 2004).
5. N. Sneddon, S. Ulam, and M. Stark, Operational Calculus in Two Variables and its Applications (Pergamon Press Ltd, 1962).