APA (7th ed.) Citation

Leonessa, V., Acar, T., Montano, M. C., & Garrancho, P. Operator Methods in Approximation Theory. Wiley.

Chicago Style (17th ed.) Citation

Leonessa, Vita, Tuncer Acar, Mirella Cappelletti Montano, and Pedro Garrancho. Operator Methods in Approximation Theory. Wiley.

MLA (9th ed.) Citation

Leonessa, Vita, et al. Operator Methods in Approximation Theory. Wiley.