While there is scholarly consensus regarding the importance of news sources, there are rather few comparative studies on how the media use sources. In addition, most of these focus mostly on the coverage of specific events, and are primarily based on print media. To go beyond these limitations and test the conditionality of source use, this study compares the use of sources in routine news coverage in television news in the United States and Sweden. The results show several differences in source use in Swedish and U.S. television news, but also a more complicated pattern of source use than anticipated. Most importantly, the results point towards the conditionality of source use depending on the type of news story and topic covered. The study warns against tendencies to generalize too far from single country-studies on source use or from comparative studies that are based on the media coverage of specific events or a single medium only.