Source: https://www.researchgate.net/profile/Umar-Fauzan/publication/282125159_The_Use_of_Improvisations_Technique_to_Improve_the_Speaking_Ability_of_EFL_Students/links/5603ecdd08ae460e27050b2a/The-Use-of-Improvisations-Technique-to-Improve-the-Speaking-Ability-of-EFL-Students.pdf