Παραπομπή σε μορφή APA (7η εκδ.)

Helton, J. W., & Ball, J. A. (1987). Operator theory, analytic functions, matrices, and electrical engineering. American Mathematical Society.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Helton, J. William, και Joseph A. Ball. Operator Theory, Analytic Functions, Matrices, and Electrical Engineering. Rhode island: American Mathematical Society, 1987.

Παραπομπή σε μορφή MLA (9th εκδ.)

Helton, J. William, και Joseph A. Ball. Operator Theory, Analytic Functions, Matrices, and Electrical Engineering. American Mathematical Society, 1987.