Greenwood, I. A., Holdam, J. V., & MacRae, D. (1948). Electronic instruments. McGraw-Hill Book Co..

Greenwood, Ivan A., J. Vance Holdam, and Duncan MacRae. Electronic Instruments. New York: McGraw-Hill Book Co., 1948.

Greenwood, Ivan A., et al. Electronic Instruments. McGraw-Hill Book Co., 1948.