Gaya APA

Gabel, R, , A., Roberts, R, A. (1987). Signals and linear systems (3rd ed). New York: John Wiley & Sons, Inc..

Gaya MLA

Gabel, Robert, , A.., Roberts, Richard, A.. "Signals and linear systems". 3rd ed New York: John Wiley & Sons, Inc., 1987. Printed Book.