Rumble, G., & Oliveira, J. (1992). Vocational education at a distance: International perspectives. Kogan Page in association with the International Labour Office.
Lua i Stíl Chicago (17ú heag.)Rumble, Greville, agus Joa̧o Oliveira. Vocational Education at a Distance: International Perspectives. London: Kogan Page in association with the International Labour Office, 1992.
Lua MLA (8ú heag.)Rumble, Greville, agus Joa̧o Oliveira. Vocational Education at a Distance: International Perspectives. Kogan Page in association with the International Labour Office, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.