==References==* "Seabirds" by Harrison, ISBN 0-7470-1410-8* "Birds of The Gambia" by Barlow, Wacher and Disley, ISBN 1-873403-32-1* Pons J.M., Hassanin, A., and Crochet P.A.(2005).
* "Seabirds" by Harrison, ISBN 0-7470-1410-8* "Birds of The Gambia" by Barlow, Wacher and Disley, ISBN 1-873403-32-1* Pons J.M., Hassanin, A., and Crochet P.A.(2005).