APA (7th ed.) Citation

Beyer, R. T., & Letcher, S. V. (1969). Physical ultrasonics. Acad. Press.

Chicago Style (17th ed.) Citation

Beyer, Robert T., and Stephen V. Letcher. Physical Ultrasonics. New York: Acad. Press, 1969.

MLA (9th ed.) Citation

Beyer, Robert T., and Stephen V. Letcher. Physical Ultrasonics. Acad. Press, 1969.