Cita APA

Armstrong, T. G., & Gotsman, M. S. (1973). Initial low frequency vibrations of the first heart sound.

Chicago Style Citation

Armstrong, T G., i M S. Gotsman. Initial Low Frequency Vibrations of the First Heart Sound. 1973.

Cita MLA

Armstrong, T G., i M S. Gotsman. Initial Low Frequency Vibrations of the First Heart Sound. 1973.