Ernawati, Yuri Pratiwi Utami , Abdul Halim Umar,.
" Analysis of Total Anthocyanin Content on Ethanol Extract of Purple Sweet Potato (Ipomoea batatas L.) and Purple Yam (Dioscoreaalata L.) with Differential pH Method" <em>Journal of Pharmaceutical and Medicinal Sciences</em> [Online], Volume 1 Number 2 (5 March 2017)