Laufer, I., & Levine, M. S. (1992). Double contrast gastrointestinal radiology.
芝加哥风格引文Laufer, Igor, 与 Marc S. Levine. Double Contrast Gastrointestinal Radiology. 1992.
MLA引文Laufer, Igor, 与 Marc S. Levine. Double Contrast Gastrointestinal Radiology. 1992.
警告：这些引文格式不一定是100％准确.