The value of this research is as follows: first, although there has been research noting that users in the business field extensively utilize commercial websites, while those in arts and sciences dominantly utilize printed materials, those aspects have not been investigated in the context of ULWR. Second, this study's comparative report across all sources is considered to be valuable to the field because it goes beyond anecdotal discussion by investigating discipline differences statistically. Third, this study attempts to offer a holistic view of ULWR. In other words, while existing studies have used a piecemeal approach to exploring one discipline at a time via syllabi, this study surveyed users in different disciplines and compared them.