“The Effect Of Planting Distance and Dosage Of Fertilizing Cow Manage On Production Products Red Rosella (Hibiscus sabdariffa L.): Pengaruh Jarak Tanam dan Dosis Pemberian Pupuk Kandang Sapi Terhadap Hasil Produksi Rosela Merah (Hibiscus sabdariffa L.)” (2022) Procedia of Engineering and Life Science, 2(2). doi:10.21070/pels.v2i2.1267.