Agustini, Yusia, 		Purwatiningsih, P., AND 		Sulistyanto, Didik.
" Combination of Organic Fertilizer and Biological Agent for Pest Control Spodoptera exigua of Plant Onion in Gending, Probolinggo" <em>Jurnal ILMU DASAR</em> [Online], Volume 18 Number 2 (26 October 2017)