WASET
Derun, E. , Kipcak, A. , Ozdemir, O. , Demir, F. , Karakoc, M. , Piskin, S. (2013). 'Caffeine Content Investigation in the Turkish Black Teas'. World Academy of Science, Engineering and Technology, Open Science Index 81, International Journal of Chemical and Molecular Engineering, 7(9), 708 - 711.