APA (7th ed.) Citation

OPPENHEIM, A. V., WILLSKY, A. S., & NAWAB, S. H. (1997). Signals and systems.-- ed.2. Prentice Hall.

Chicago Style (17th ed.) Citation

OPPENHEIM, Alan V., Alan S. WILLSKY, and S Hamid NAWAB. Signals and Systems.-- Ed.2. London: Prentice Hall, 1997.

MLA (9th ed.) Citation

OPPENHEIM, Alan V., et al. Signals and Systems.-- Ed.2. Prentice Hall, 1997.