1. BirdLife International Cambridge CB2 3QZ U.K.
2. Burung Indonesia Bogor 16161 Indonesia
3. Forest Program III Sulawesi, Palu Central Sulawesi 94111 Indonesia
4. Sam Ratulangi University (UNSRAT) Manado 95115 Indonesia
5. School of Science and Environment Manchester Metropolitan University Manchester M1 5GD U.K.