REFERENCES
- Acocks , J. P.H. 1975 . Veld Types of South Africa 40 Mem. Bot. Survey S.A
- Brooke , R. K. 1984 . South African Red Data Book—Birds. . S. Afr. Nat. Sci. Prog. Rpt. , 97 : 1 123
- Collar , N J. and Stuart , S. N. 1985 . Threatened Birds of Africa and Related Islands. ICBP/IUCN Red Data Book. Part 1 Cambridge : IUCN . 3rd edn. ICBP/
- Donelly , B. G. 1982 . Cold-induced mortality in African Palm Swifts. . Honeyguide 111 , 112 : 15 – 17 .
- Earlé , R. 1987 . Measurements, moult and timing of breeding in the Blue Swallow. . Ostrich , 58 : 182 – 185 .
- Earlé , R. 1989 . Breeding biology of the Red-breasted Swallow Hirundo atrocaerulea . Ostrich , 60 : 13 – 21 .
- Fry , C. H. , Keith , S. and Urban , E. K. 1988 . The Birds of Africa New York : Academic Press . III
- Johnson , D. N. , Morford , J. S. and Croft , M. 1996 . Digging for the Blue Swallow-Does it Work?-is it ethical? . Lammergeier , 44 : 46 – 49 .
- Mackworth-Praed , C. W. and Grant , C. H.B. 1955 . Birds of Eastern and North Eastern Africa London : Longmans, Green and Co .
- Morgan , D. 1995 . “ Kaapsehoop B.S.W.G.: Monitoring records 1994/5 season for the Blue Swallow ” . In Hirundo atrocaerulea. Unpublished Report
- Rijke , A. M. , Jesseur , W. A. , Evans , S. W. and Bouwman , H. 2000 . Water repellency and feather structure of the Blue Swallow Hirundo atrocaerulea . Ostrich , 71 : 143 – 145 .
- Snell , M. L. 1970 . Nesting behaviour of a pair of Blue Swallows. . Bokmakierie , 22 : 27 – 29 .
- Turner , A. and Rose , C. 1989 . A handbook to the Swallows and Martins of the world London : Christopher Helm .