Perraton, H. D. (1982). Alternative routes to formal education: Distance teaching for school equivalency. Published for the World Bank [by] Johns Hopkins University Press.
Lua i Stíl Chicago (17ú heag.)Perraton, H. D. Alternative Routes to Formal Education: Distance Teaching for School Equivalency. Baltimore: Published for the World Bank [by] Johns Hopkins University Press, 1982.
Lua MLA (9ú heag.)Perraton, H. D. Alternative Routes to Formal Education: Distance Teaching for School Equivalency. Published for the World Bank [by] Johns Hopkins University Press, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.