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WikiPedia: Pemerhatian burung http://www.aba.org/birding/v38n1p20.pdf http://www.aba.org/birding/v38n2p20.pdf http://www.aba.org/birding/v38n3p18.pdf http://www.aba.org/birding/v38n4p18.pdf http://www.aba.org/birding/v38n5p18.pdf http://www.aba.org/birding/v38n6p18.pdf http://www.AllAboutBirds.org/ http://video.idahoptv.org/video/1513625536/ //www.worldcat.org/oclc/50228297 //www.worldcat.org/oclc/8960462