Audubon birdfeeder handbookde Robert BurtonMateriasBird attractingBehaviorBirdsEdiciones (1)National Audubon Society Bird Feeder Handbook (2005)DK Publishing, Inc. · ISBN 9780756617226Más obras de Robert BurtonThe Funk & Wagnalls wildlife encyclopediaAnimal homesAAudubon North American birdfeeder guideAudubon North American birdfeeder guide