Setiati, R., Siregar, H. P. S., Marhaendrajana, T., & Wahyuningrum, D. (2017). Infra Red Evaluation of Sodium Lignosulfonate Surfactant (SLS). The International Journal of Science & Technoledge, 5(3). Retrieved from http://internationaljournalcorner.com/index.php/theijst/article/view/123451