Integrated writing tasks have increased in popularity in second language writing classrooms. Extensive research on these tasks has examined the challenges that students face when completing such tasks. One significant challenge is the transformation of source language use when students integrate source information into their own essays. However, little is known about the relationship between students' source notes and the quality of the essays that they produce. This exploratory study examined this issue by investigating the relationship between characteristics of English for academic purposes (EAP) students' notes (N = 24) and their essay scores. The students' notes were coded in terms of how they appropriated information from the source texts using four categories: copied, copied with changes, copied with gaps, and paraphrased. A multiple linear regression revealed that essay scores were predicted by the degree to which the students transformed source language and avoided copying. The implications of these findings for second language (L2) writing pedagogy and assessment are discussed.