Reference: Hayes J. R, (2000). A new framework for understanding a cognition and affect in writing. Perspectives on writing: Research, theory, and practice. 

Reference: 
​Missakian, I., Olson, C.B., Black, R.W., & Matuchniak, T. (2016). Writing Center Efficacy at the Community College: How Students, Tutors, and Instructors Concur and Diverge in Their Perceptions of Services. Teaching English in the Two Year College. Vol. 44, No. 1. September.

Reference: Graham, S. (2018). A revised writer (s)-within-community model of writing. Educational Psychologist, 53(4), 258-279.