1. Pendukung Teknologi Proses Produksi Case of Gondorukem and Terpentin Production Centre in Sapuran Wonosobo Central Java
2. Oleh Muhammad Arman Susilawati Ahmad Husni Abdul Karim Dosen Pengampu : Ahmad Agus Setiawan, S.T., M.Sc. PhD TIKM-MST OKTOBER 2009 MEI 2010
3. Background Sapuran Manufacturing Centre owned by PT Perhutani Produce Gondorukem (Gum resin) and terpentin from pine resin Produce +/- 40 ton Gondorukem/day and +/- 10 ton terpentin/day 11/05/2010 3