APA (7th ed.) Citation

Pennisi, L. L. (1966). Elements of complex variables. Holt, Rinehart and Winston.

Chicago Style (17th ed.) Citation

Pennisi, Louis L. Elements of Complex Variables. New York [etc.]: Holt, Rinehart and Winston, 1966.

MLA (9th ed.) Citation

Pennisi, Louis L. Elements of Complex Variables. Holt, Rinehart and Winston, 1966.