1. Brown, H.D. (2001). Teaching by Principles: An Interactive Approach to Language Pedagogy. (2nd Ed). New York: Addison Wesley Longman, Inc.
2. Chitravelu, N. et. al. (2005). ELT Methodology: Principles and Practice. (2nd Ed.). Shah Alam: Penerbit Fajar Bakti Sdn. Bhd. Gribbin, Bill. The Role of Generalization in Studying Grammar and Usage. English Journal, 55-58.
3. Guerrero, Augustina. Technology Grabbing Bigger Role in Classrooms. Knight Rideder/Tribune News Serv.
4. Hawanum, Hussien. (2004). Using Simple Poems to Teach Grammar. The Internet TESL Journal, 10(5). Retrieved on 12 November 2009 from http://iteslj. Org/Techniques/Hussien Poems. html.
5. Margaret Tomlinson Rustick (2007). Grammar Games in the Age of Anti-Remediation. ProQuest Education Journals. Musilova L. (2010). Grammar Games in ELT. Bachelor Thesis. Retrieved on 20 August 2012 from http://is.muni.cz/th152741pedf/Grammar Games_in ELT.pdf.