Swift, D. G. Physics for rural development a source book for teachers and extension workers in developing countries. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Swift, Digby G. Physics for Rural Development a Source Book for Teachers and Extension Workers in Developing Countries. John Wiley and Sons.
Lua MLA (8ú heag.)Swift, Digby G. Physics for Rural Development a Source Book for Teachers and Extension Workers in Developing Countries. John Wiley and Sons.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.