Blewitt, J. Understanding sustainable development (Third edition.).
Chicago-čujuhus (17. p.)Blewitt, John. Understanding Sustainable Development. Third edition.
MLA-čujuhus (9. p.)Blewitt, John. Understanding Sustainable Development. Third edition.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.