A. A. A. Torimtubun, L. K. Singagerda, and L. Ernawati, “The training of tempeh yoghurt and tempeh brownies production as an effort to increase the sell-ing value of tempeh in the somber small industrial estate, Balikpapan”, B.JPMI, vol. 1, no. 2, pp. 69-79, Dec. 2018.