Azeiteiro, U., Leal Filho, W., & Caeiro, S. (2014). E-learning and education for sustainability. PL Academic Research.
Chicago-čujuhus (17. p.)Azeiteiro, Ulisses, Walter Leal Filho, juo Sandra Caeiro. E-learning and Education for Sustainability. Frankfurt am Main, [Germany]: PL Academic Research, 2014.
MLA-čujuhus (9. p.)Azeiteiro, Ulisses, et al. E-learning and Education for Sustainability. PL Academic Research, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.