Costello, M. (1992). Net migration in the Philippines: 1980-1990. Department of Labor and Employment/ILO-ARTEP.
Lua i Stíl Chicago (17ú heag.)Costello, Michael. Net Migration in the Philippines: 1980-1990. Manila: Department of Labor and Employment/ILO-ARTEP, 1992.
Lua MLA (9ú heag.)Costello, Michael. Net Migration in the Philippines: 1980-1990. Department of Labor and Employment/ILO-ARTEP, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.