Perera และผู้แต่งคนอื่นๆ. 2009. International contract labour migration and children left behind in Sri Lanka : the impact on children's educationEllawala Liyanage Sunethra Jayathilake Perera. Institute for Population and Social Research, Mahidol University;
Perera และผู้แต่งคนอื่นๆ. (2009) International contract labour migration and children left behind in Sri Lanka : the impact on children's educationEllawala Liyanage Sunethra Jayathilake Perera . Mahidol University/Bangkok.
Perera และผู้แต่งคนอื่นๆ. International contract labour migration and children left behind in Sri Lanka : the impact on children's educationEllawala Liyanage Sunethra Jayathilake Perera. . Bangkok:Mahidol University, 2009.
Perera และผู้แต่งคนอื่นๆ. (2009) International contract labour migration and children left behind in Sri Lanka : the impact on children's educationEllawala Liyanage Sunethra Jayathilake Perera . Mahidol University/Bangkok.