Hermansyah, D., Hanani, N. and Muhaimin, A.W. 2017. Factors Affecting GRDP and Efficiency Level of Food Crops Sub-sector in East Java. HABITAT. 28, 1 (Jul. 2017), pp.22–27. DOI:https://doi.org/10.21776/ub.habitat.2017.028.1.4.