Andrew Pierce และ Philip D. Round. (2013) Assessing the status of scarce passerine migrants in northern Thailand. King Mongkut's University of Technology Thonburi:ม.ป.ท.Andrew Pierce และ Philip D. Round. 2013. Assessing the status of scarce passerine migrants in northern Thailand. ม.ป.ท.:King Mongkut's University of Technology Thonburi;Andrew Pierce และ Philip D. Round. Assessing the status of scarce passerine migrants in northern Thailand. ม.ป.ท.:King Mongkut's University of Technology Thonburi, 2013. Print.