Spiegel, M. R. (1964). Complex variables: With an introduction to conformal mapping and its applictions, theory and problems.

Spiegel, Murray R. Complex Variables: With an Introduction to Conformal Mapping and Its Applictions, Theory and Problems. New York, New York : McGraw-Hill, 1964.

Spiegel, Murray R. Complex Variables: With an Introduction to Conformal Mapping and Its Applictions, Theory and Problems. 1964.