Droga, L., & Humphrey, S. (2002). Getting Started with Functional Grammar.
Eggins, S. (2007). An Introduction to Systemic Functional Linguistics (2nd. ed.). London/New York: Continuum.
Thomson, E., & Droga, L. (2012). Effective Academic Writing: An Essay-writing Workbook for School and                             University: Phoenix Education.
Advanced Reading: 

Halliday, M. A. K. (2014). Halliday's introduction to functional grammar. Revised by Christian M. I. M. Matthiessen (4th           ed.). London & New York: Taylor & Francis.