This dissertation investigates the challenges faced by learners of English for academic purposes (EAP) when required to complete writing assignments that use source texts. In order to address this problem, I explore the issue from the perspectives of applied linguistic researchers, writing program administrators, and classroom composition instructors. These three perspectives are highlighted in distinct articles that build on one another to create a more complete understanding of the challenges that EAP students face when writing from sources. The first article contains a literature review of relevant studies that explore the reading-to-write construct. Experts suggest that unintentional plagiarism, or patchwriting, can be attributed to a lack of cultural and linguistic competence. In order to address these limitations, researchers identify several reading and writing subskills that are integral to success in academic source writing. The literature review concludes with recommendations for teaching and testing contexts. The second article details a rater training evaluation study that resulted in unexpected, but welcomed, recommendations. Teacher-raters provided feedback that influenced how the institution made use of benchmark portfolios to train teacher-raters as well as inform students about writing achievement standards. The increased use of benchmark portfolios also helped to clarify classroom and program standards regarding citation, attribution, and anti-plagiarism policies. The final article is a practical guide for classroom composition instructors. I outline a recommended curriculum for teaching source writing to EAP students. The guide incorporates the findings of the literature review and the evaluation study into a collaborative and iterative pedagogical model. This recursive approach to EAP writing instruction helps students to diagnose and develop the advanced literacy subskills required for successful source integration into their writing. As a set, the three articles demonstrate that effective solutions to instructional issues can be developed when a problem is approached from multiple perspectives. Indeed, linguistics-based research, program administration, and teacher experience can be combined to produce a model for writing instruction that acknowledges principles of second-language advanced literacy and accounts for learner struggles as students develop source writing skills.