Brown, J. W., & Churchill, R. V. (1987). Fourier Series and Boundary Value Problems (4th ed.). McGraw-Hill.

Brown, James Ward, and Ruel V. Churchill. Fourier Series and Boundary Value Problems. 4th ed. New York: McGraw-Hill, 1987.

Brown, James Ward, and Ruel V. Churchill. Fourier Series and Boundary Value Problems. 4th ed. McGraw-Hill, 1987.