एपीए उद्धरण

Ludyk, G. (1981). Time-variant discrete-time systems. Vieweg.

शिकागो स्टाइल उद्धरण

Ludyk, Gunter. Time-variant Discrete-time Systems. Braunschweig: Vieweg, 1981.

एमएलए उद्धरण

Ludyk, Gunter. Time-variant Discrete-time Systems. Vieweg, 1981.