APA (7th ed.) Citation

Haykin, S. S. (1989). An introduction to analog and digital communications. John Wiley & Sons.

Chicago Style (17th ed.) Citation

Haykin, Simon S. An Introduction to Analog and Digital Communications. New York [etc.]: John Wiley & Sons, 1989.

MLA (9th ed.) Citation

Haykin, Simon S. An Introduction to Analog and Digital Communications. John Wiley & Sons, 1989.