Rumble, G. The costs and economics of open and distance learning.
Lua i Stíl Chicago (17ú heag.)Rumble, Greville. The Costs and Economics of Open and Distance Learning.
Lua MLA (8ú heag.)Rumble, Greville. The Costs and Economics of Open and Distance Learning.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.