Oppenheim, A. V., Willsky, A. S., & Nawab, S. H. (1997). Signals & systems (2nd ed.). Prentice Hall ; PHI Learining.
Lua i Stíl Chicago (17ú heag.)Oppenheim, Alan V., Alan S. Willsky, agus Syed Hamid Nawab. Signals & Systems. 2nd ed. Upper Saddle River, N.J. : New Delhi: Prentice Hall ; PHI Learining, 1997.
Lua MLA (8ú heag.)Oppenheim, Alan V., et al. Signals & Systems. 2nd ed. Prentice Hall ; PHI Learining, 1997.
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