Electronic stethoscope.

MLA

Walshe, James C. “Electronic Stethoscope.” Journal of the Acoustical Society of America, vol. 67, no. 5, May 1980, p. 1857. EBSCOhost, https://doi.org/10.1121/1.384224.

APA

Walshe, J. C. (1980). Electronic stethoscope. Journal of the Acoustical Society of America, 67(5), 1857. https://doi.org/10.1121/1.384224

Chicago

Walshe, James C. 1980. “Electronic Stethoscope.” Journal of the Acoustical Society of America 67 (5): 1857. doi:10.1121/1.384224.