S1: Program Budidaya Pertanian. Fakultas Pertanian, Universitas Simalungun, Pematang Siantar, 1996.
S2: Program Agronomi. Fakultas Pertanian, Institut Pertanian, Bogor, 2001.
Ka. Ur. UKDP
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- Efficiency of agriculture practice to increase benefit in oil palm plantation through high density planting Proceedings PIPOC International Palm Oil Congress: Palm Oil : Empowering Change. Kuala Lumpur 26 - 30 Agustus 2007. Agiculture, Biotechnology & Sustaianabilty conference. 10 Hal.
- Leaf gas exchanges of oil palm under soil water variation in four different ecologies : modelling comparison Proceedings International Oil Palm Conference: Optimum use of resources : Challenges and Opppurtinities for Sustainable Oil Palm Development. Agriculture, Bali 19 - 23 June 2006. 3 Hal.