APA সাইটেশন

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

শিকাগো স্টাইলে সাইটেশন

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

এমএলএ সাইটেশন

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