HARYSUSANTO, DAVID, WIJANA, GEDE, AND KARTINI, NI LUH. " Pengaruh Dosis Pupuk Kotoran Ayam dan Nitrogen terhadapPertumbuhan dan Hasil Sayur Sawi Daging (Brassica rapa L.) Varietas Gardena" Agrotrop : Journal on Agriculture Science [Online], Volume 4 Number 2 (11 September 2015)