This paper investigates how firms select reference organizations, that is, other firms to which they compare themselves. We question the exogenous nature of references (i.e., them being defined via industry-categorizations) but suggest that, via motivations or purposes, firms endogenously select them. We evaluate our findings when analyzing proprietary data on hotels' self-selection of comparison-hotels. In support of our arguments, we find that in situations of increased uncertainty regarding firms' own relative abilities and standing, firms make adjustments to their selected references toward more similar ones. This enables them to obtain more diagnostic information about their relative abilities and this effect holds constant of (exogenous) industry-entry or exit events. Our findings contribute to an updated understanding about the role of comparison organizations in firms' decision-making. Managerial Summary: Prior work shows that comparisons with other firms (i.e., references) play an important role for our understanding of firms' decision-making. For example, performance comparisons with references can trigger search or a decision-need, ultimately, leading to acquisition-decisions, new-product-introductions, and