R. E. ELSA SURYA, “PENGARUH PENGOMPOSAN TERHADAP RASIO C/N KOTORAN AYAM DAN KADAR HARA NPK TERSEDIA SERTA KAPASITAS TUKAR KATION TANAH (COMPOSTING EFFECT OF CHICKEN MANURE TOWARDS C/N RATIO AND AVAILABLE NPK NUTRIENT AND SOIL CATION EXCHANGE CAPACITY)”, UJC, vol. 2, no. 1, Jan. 2013.