Yusuf, D., Hamdani, and K. Kholik. “The Effect of Buy and Sell Financing (Murabahah), Profit Share Financing (Mudarabah), Equity Capital Financing (Musyarakah) and Non-Performing Financing Ratio on Profitability Level of Sharia Commercial Banks in North Sumatera”. Britain International of Humanities and Social Sciences (BIoHS) Journal, Vol. 1, no. 1, June 2019, pp. 81-88, doi:10.33258/biohs.v1i1.18.