Djumidi, Djumidi (1983) Bandingan Kandungan Golongan Kimia Kulit Kayu Daun Muda dan Daun Tua Alstonia Scholaris R. BR.(Laporan Penelitian). Project Report. Balai Penelitian Tanaman Obat Tawangmangu, Jawa Tengah. (Unpublished)