APA-referens (7:e uppl.)
Azeiteiro, U., Leal Filho, W., & Caeiro, S. (2014). E-learning and education for sustainability. PL Academic Research.
Chicago-referens (17:e uppl.)
Azeiteiro, Ulisses, Walter Leal Filho, och Sandra Caeiro. E-learning and Education for Sustainability. Frankfurt am Main, [Germany]: PL Academic Research, 2014.
MLA-referens (9:e uppl.)
Azeiteiro, Ulisses, et al. E-learning and Education for Sustainability. PL Academic Research, 2014.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.