SONNENBERG ERIC [red.] 547,501 International ultrasound / ed. by Eric van Sonnenberg ; [contributors John A. Callahan et al.]. - New York [etc.] : Churchill Livingstone, 1987. - XIV, 241 s. : il., wykr. ; 25 cm (Clinics in Diagnostic Ultrasound ; vol. 21) ISBN 0-443-08430-0