Suer Suryadi, author
Movement Patterns Of The Sulawesi Red-Knobbed Hornbill, Aceros Cassidix In Tangkoko-Dua Sudara Nature Reserve, North Sulawesi
Universitas Indonesia, 1997
 UI - Tesis (Membership)
Jones, Gavin W., author
The population of North Sulawesi
Gajah Mada University Press, 1977
 Buku Teks
Suryadi, author
Tingkah laku makan rangkong Sulawesi Rhyticeros cassidix Temminck (aves: bucerotidae) pada masa tidak berbiak di cagar alam Tangkoko - Batuangus, Sulawesi
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1994
 UI - Skripsi (Membership)
Distribution of monogonont rotifers,brachionus spp in North Sulawesi
 Artikel Jurnal
Yu, Yan, author
The Arjin mountain nature reserve
Intercontinental Press, 2008
 Buku Teks
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