APA
Oppenheim A.V, Buck & Schafer R.W. (1999). Discrete Time Signal Processing. Singapore: Pearson Education.
Chicago
Oppenheim A.V, Buck and Schafer R.W. 1999. Discrete Time Signal Processing. Singapore: Pearson Education.
Harvard
Oppenheim A.V, Buck and Schafer R.W. (1999). Discrete Time Signal Processing. Singapore: Pearson Education.
MLA
Oppenheim A.V, Buck and Schafer R.W. Discrete Time Signal Processing. Singapore: Pearson Education. 1999.