1. Lubis, I. 1999. The Optimize of Agricultural Resources with Environmental Perspective, University of Jenderal Sudirman, Purwokerto, Indonesia, 27 November 1999.  (read)
  2. Lubis, I. Organic Farming for minimizing pesticide residue in agricultural products and its’ regulations. Seminar on Veteriner Parasitology and Toxicology. Bogor, 20-21 April 2004. (read)
  3. H. Purnamawati, I. Lubis, YW.E. Kusumo and A. Rais. 2009. Karakteristik Pengisian Biji Kacang Tanah. Pusat Penelitian Tanaman Pangan, Bogor, Asustus 2009 Seminar Nasional Inovasi Teknologi Padi dan Palawija. Pusat Penelitian Tanaman Pangan, Bogor, Agustus 2009.    (read)
  4. RK. Dewi, M. H. Bintoro, I. Lubis and  D. Allorerung. 2009. The Effect of Foliar Spray Application on Young Sago Palm Growth at PT. National Timber and Forest Product, Selat Panjang, Riau. 1st Asean Sago Symposium. Kuching, Sarawak, Malaysia, October 2009. (read)
  5. S. Amarillis, .M.H Bintoro, AP. Lontoh, I. Lubis, and D. Allorerung. 2009. Weeding  on Sago Plantation at PT. National Timber and Forest Product, Tebing Tinggi island, Meranti, Riau, Indonesia. 1st Asean Sago Symposium. Kuching, Sarawak, Malaysia, October 2009.  (read)
  6. A. Rahman, I.Lubis, M. H. Bintoro And D. Allorerung. 2009. The Effect Of Plant Spacing On Sago Palm (Metroxylon Spp.) Growth International Symposium & Seminar, ”The Holistic Interaction Between Living Organism and Environment For Better Quality of Living”, Bogor November 2009.  (read)
  7. E. Wiraguna, M.H Bintoro, I. Lubis, P. Wahid and D. Allorerung. 2009.Number of Trunk Estimation in Sago Palm Plantation. International Symposium & Seminar, ”The Holistic Interaction Between Living Organism and Environment For Better Quality of Living”, Bogor November 2009.  (read)
  8. RK. Andany, H. M. H. Bintoro, P. Wahid,  I. Lubis and D. Allorerung 2009. . Effect Of Number Of Sucker On Sago Palm ( Metroxylon Spp.), Growth And Development. International Symposium & Seminar, ”The Holistic Interaction Between Living Organism and Environment For Better Quality of Living”, Bogor November 2009.  (read)