Fardhyanti, D. , Mulyono, P. , Sediawan, W. , Hidayat, M. (2013), 'Extraction of Phenol, o-Cresol, and p-Cresol from Coal Tar: Effect of Temperature and Mixing', World Academy of Science, Engineering and Technology, Open Science Index 78, International Journal of Chemical and Molecular Engineering, 7(6), 454 - 458.