APA (7th ed.) Citation

Wells, P. N. T. (1969). Physical principles of ultrasonic diagnosis. Academic Press.

Chicago Style (17th ed.) Citation

Wells, P. N. T. Physical Principles of Ultrasonic Diagnosis. London: Academic Press, 1969.

MLA (9th ed.) Citation

Wells, P. N. T. Physical Principles of Ultrasonic Diagnosis. Academic Press, 1969.