10.25662/h456-v9qq
Gibson-Hill, C. A.
Sittidae - Nuthatches
Government Printing Office, Singapore
1949
Journal Article
http://blsea.nus.edu.sg/en/persistent/a9ab9c84-f7b2-4618-8d9e-0a0419ef9cd9#page=166
Bulletin of the Raffles Museum, Singapore, Issue 20, pp. 162-163
National University of Singapore