This document discusses a study that aimed to identify sources of knowledge for first-year students entering a gateway science course. Researchers interviewed 8 students to understand their epistemic beliefs and sources of knowledge. They found students drew knowledge from perceptual, memorial, deductive, inductive, and testimony-based sources. The researchers provided 10 recommendations for science instructors, including assessing students' epistemologies and ways of knowing, using evidence-based teaching methods to promote conceptual understanding and sophisticated epistemic beliefs, and employing authentic science activities and social learning tools.