Callen, P. W. (1988). Ultrasonography in obstetrics and Gynecology.
Chicago-čujuhus (17. p.)Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 1988.
MLA-čujuhus (9. p.)Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 1988.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.