http://www.moc.go.th/opscenter/ub/Touring%20&%20Interest%20place/Plajone%20Fish%20rudder.htm

http://www.livingriversiam.org/Th/PMD.htm

http://www.baanjomyut.com/library/law/02/041.html

http://www.thaichicago.net/ebook/law/fishery1.pdf