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Niswati, Ainin and Nugroho, Sutopo Ghani (1996) Penerapan Pupuk Hijau Azolla sebagai Pensubsitusi Pupuk Urea pada Padi Sawah di Lampung tengah. Journal of Tropical Soils, 2 (2). pp. 84-90. ISSN 0852-257X

Terry, P.J. and Adjers, G. and Akobundu, I.O. and Anoka, A.U. and Drilling, M.E. and Tjitrosemito, S and Utomo, Muhajir (1996) Herbicides and mechanical control of Imperata cylindrica as a first step in grassland rehabilitation. Agroforestry Systems, 36. pp. 151-179. ISSN 0167-4366