American Psychological Association. (n.d.). Academic Writer. Academic Writer is a free resource to all NCU students to support your proficiency in the use of APA style in academic writing including for literature review.
Rocco, T. S., & Hatcher, T. G. (2011). The handbook of scholarly writing and publishing. John Wiley & Sons, Incorporated. Read chapter 10 - “Developing a Research Problem and Purpose Statement”
Lauchman, R. (2010). Punctuation at work: Simple principles for achieving clarity and good style. AMACOM. Choose any chapters from this book that seem most helpful to you.