Pembukuan, Balitbang, Kemendikbud
Alves, Anabela Reis (2008). Process Writing. The University of Birmingham
Hammond, Jenny (1992). English for Social Purposes. National Centre for
English Language Teaching and Reseach, Macquarie University Sydney.
Richmond, Lydia. (2016, June 15). Three Purposes of Writing. Retrieved May 4,
2019, from http://www.clutteredgenius.com/three-purposes-writing/
Meer, Syed Hunbbel .(2016, May 10). Four Different Types of Writing Styles:
Expository, Descriptive, Persuasive, and Narrative. Retrieved May 4, 2019,
from https://owlcation.com/humanities/Four-Types-of-Writing
Rahmi, Regina. 2014. The Implementation of Media in English Language
Teaching. STKIP Bina Bangsa