APA (7th ed.) Citation

(1990). Duplex doppler ultrasound. Churchill Livingstone.

Chicago Style (17th ed.) Citation

Duplex Doppler Ultrasound. New York u.a: Churchill Livingstone, 1990.

MLA (9th ed.) Citation

Duplex Doppler Ultrasound. Churchill Livingstone, 1990.

Warning: These citations may not always be 100% accurate.