Umar, Z., A. Bashir, and S. Raubilu. “Study on Bacteriological Quality of Kunun Aya (Tigernut Juice) Sold at Umaru Musa Yar’adua University (UMYU) Campus, Katsina”. International Journal of Environment, vol. 3, no. 2, May 2014, pp. 87-97, doi:10.3126/ije.v3i2.10518.