1. Advisory Panel on White House Tapes. (1974). The executive office building tape of June 20, 1972: Report on a technical investigation, United States District Court for the District of Columbia.
2. Begault, D. R., Brustad, B. M., and Stanley, A. M. (2005). Tape analysis and authentication using multi-track recorders, in Proceedings of Audio Engineering Society 26th Conference, Audio forensics in the digital age, Denver, CO (pp. 115–121).
3. Bolt, R. H., Cooper, F. S., David, E. E., Denes, P. B., Pickett, J. M., & Stevens, K. N. (1969). Identification of a speaker by speech spectrograms. Science, 166(3903), 338–342.
4. Bolt, R. H., Cooper, F. S., David, E. E., Denes, P. B., Pickett, J. M., & Stevens, K. N. (1970). Speaker identification by speech spectrograms: A scientist’s view of its reliability for legal purposes. Journal of the Acoustical Society of America, 47(2), 597–612.
5. Bolt, R. H., Cooper, F. S., David, E. E., Denes, P. B., Pickett, J. M., & Stevens, K. N. (1973). Speaker identification by speech spectrograms: Some further observations. Journal of the Acoustical Society of America, 54(2), 531–534.