एपीए उद्धरण

Keller, A. C. (1937). Direct recording and reproducing materials for disk recording. Bell telephone system B-998.

शिकागो स्टाइल उद्धरण

Keller, A. C. "Direct Recording and Reproducing Materials for Disk Recording." Bell Telephone System B-998 1937.

एमएलए उद्धरण

Keller, A. C. "Direct Recording and Reproducing Materials for Disk Recording." Bell Telephone System B-998 1937.