Phrutthipong Nujnart. (1999) Cooperation on prevention of faked jewelry purchase of the lapidary investors in Bangkok Metropolis. Mahidol University,:ม.ป.ท.Phrutthipong Nujnart. 1999. Cooperation on prevention of faked jewelry purchase of the lapidary investors in Bangkok Metropolis. ม.ป.ท.:Mahidol University,;Phrutthipong Nujnart. Cooperation on prevention of faked jewelry purchase of the lapidary investors in Bangkok Metropolis. ม.ป.ท.:Mahidol University, 1999. Print.