File:Ptyonoprogne Concolor Map.png
Based on data from
- Lekagul, Boonsong; Round, Philip (1991) A Guide to the Birds of Thailand Saha Karn Baet ISBN 9748567362 p. 207
- Robson, Craig (2004) A Field Guide to the Birds of Thailand New Holland Press ISBN 1843309211 p. 259
- Turner, Angela K; Rose, Chris (1989). A handbook to the swallows and martins of the world. Christopher Helm. ISBN 0-7470-3202-5. p. 60
- Mapped onto BlankMap-World-large.png