Burton, R. (1990). Bird Feeder Handbook. Dorling Kindersley.
Chicago Style (17th ed.) CitationBurton, Robert. Bird Feeder Handbook. London: Dorling Kindersley, 1990.
MLA (9th ed.) CitationBurton, Robert. Bird Feeder Handbook. Dorling Kindersley, 1990.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.