TY  - JOUR
TI  - Generic limits in old world Apodidae and Hirundinidae
T2  - Bulletin of the British Ornithologists' Club
VL  - 92
UR  - https://www.biodiversitylibrary.org/part/81339
PB  - British Ornithologists' Club
CY  - London
PY  - 1972
SP  - 53
EP  - 57
AU  - Brooke, Richard K. (Richard Kendall)
ER  -