Cromwell, L., Weibell, F. J., & Pfeiffer, E. A. (1980). Biomedical instrumentation and measurements (2nd ed.). Prentice-Hall, ; PHI Learning Private Limited.

Cromwell, Leslie, Fred J. Weibell, and Erich A. Pfeiffer. Biomedical Instrumentation and Measurements. 2nd ed. Englewood Cliffs, N.J. : New D elhi: Prentice-Hall, ; PHI Learning Private Limited, 1980.

Cromwell, Leslie, et al. Biomedical Instrumentation and Measurements. 2nd ed. Prentice-Hall, ; PHI Learning Private Limited, 1980.