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Indriyanto, . and Susanto, H. (1992) INVENTARISASI TUMBUHAN BAWAH (TUMBUHAN OBAT) DI KAWASAN CALON TAMAN HUTAN RAYA GUNUNG BETUNG, LAMPUNG. Jurnal Penelitian dan Pengembangan Kehutanan, VIII (3). pp. 18-21. ISSN 0216-9525

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Lumbanraja, Jamalam and Evangelou, V.P. (1992) Potassium Quantity-Intensity Relationships in the Presence and Absence of NH4+ for Three Kentucky Soils. Soil Science, 154 (5). pp. 366-376. ISSN 0038-075X

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Nugroho, Sutopo Ghani and Yoshida, Shigekata and Kuwatsuka, Shozo (1992) Concurrent observation of several processes of nitrogen metabolism in soil amended with organic materials: V. Effects of long-term application of farmyard manure and nitrogen fertilizer on N cycling processes in upland field soil. Soil Science and Plant Nutrition, 38 (4). pp. 619-629. ISSN 0038-0768