The Evaluation of Dietary Black Soybean and Purple Sweet Potato on Insulin Sensitivity in Streptozotocin - Induced Diabetic Rats, Gofur, Abdul, Witjoro Agung, Ningtiyas Erni Widya, Setyowati Evi, Mukharromah Siti Aminatul, Atho?illah Mochammad Fitri, and Lestari Sri Rahayu , Pharmacognosy Journal, July 2019, Volume 11, Issue 4, p.639-646, (2019)