Identifying effective and time-efficient approaches to teaching students how to write from scholarly sources benefits students and instructors. Students in a general psychology course learned a concrete method to improve this type of synthesis writing. The intervention was brief, consisting of viewing an online tutorial outside of class and spending a single class period on instructor-guided practice with writing samples. Students used this method to write literature reviews for a poster assignment debunking psychological myths. Compared to a previous semester that did not learn this concrete technique, students' writing scored significantly higher on most measures of synthesis. This suggests that a short tutorial teaching a concrete application, paired with limited in-class instruction, can help improve this important aspect of writing.