Fenty Maimunah Simbolon, Murni Sari Rahayu, Yayuk Purwaningrum, and Muhamad Zepri, “THE EFFECT OF PROVISION OF CHICKEN MANURE AND N-FERTILIZER ON THE GROWTH OF PAKCOY PLANTS (Brassica rapa L.) USING THE PARALON VERTICULTURE SYSTEM”, IJERE, pp. 8–17, Dec. 2019.