Swift, D. G. Physics for rural development a source book for teachers and extension workers in developing countries. John Wiley and Sons.
Chicago-referens (17:e uppl.)Swift, Digby G. Physics for Rural Development a Source Book for Teachers and Extension Workers in Developing Countries. John Wiley and Sons.
MLA-referens (8:e uppl.)Swift, Digby G. Physics for Rural Development a Source Book for Teachers and Extension Workers in Developing Countries. John Wiley and Sons.
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