Dhanapal, S., and K. T. Wern Ling. “Six Thinking Hats: A Study to Understand the Reasons and Extent of Their Application in the English Language Classroom”. Journal of English Language and Literature (ISSN: 2368-2132), vol. 1, no. 3, June 2014, pp. 82-92, doi:10.17722/jell.v1i3.22.