Sumarno, Sumarno and Hesti Heriwati, Sri and Dwi Hartomo, Deni Efforts to Keep Forest Sustainability and Economic Improvement for the Community around Perum PERHUTANI through Product Design Approach. http://iiste.org/Journals/index.php/ADS/article/view/27409/28120, 38. pp. 41-50. ISSN 2224-6061 (Cetak) 2225-059X (Online)