Laufer, I. (1979). Double contrast gastrointestinal radiology. Saunders Company.
Cita Chicago (17th ed.)Laufer, Igor. Double Contrast Gastrointestinal Radiology. Philadelphia: Saunders Company, 1979.
Cita MLA (9th ed.)Laufer, Igor. Double Contrast Gastrointestinal Radiology. Saunders Company, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.