Dian Andanty, Ferra. “The Implementation of Project-Based Learning Method in Teaching ESP (English for Specific Purposes): Case Study”. SELL (Scope of English Language Teaching, Linguistics, and Literature) Journal, vol. 5, no. 1, Feb. 2020, pp. 77-84, http://publikasi.stkippgri-bkl.ac.id/index.php/SL/article/view/361.