Herrington, Jan, Oliver, Ron & Reeves, Thomas C.: Patterns of engagement in authentic online learning environments. Australian Journal of Educational Technology, 2003, 19. vsk, nro 1, s. 60. Australasian Society for Computers in Learning in Tertiary Education. Artikkelin verkkoversio. (HTML) Viitattu 1.11.2010. (englanti) (Arkistoitu – Internet Archive)
Herrington, Jan, Oliver, Ron & Reeves, Thomas C.: Patterns of engagement in authentic online learning environments. Australian Journal of Educational Technology, 2003, 19. vsk, nro 1, s. 60. Australasian Society for Computers in Learning in Tertiary Education. Artikkelin verkkoversio. (HTML) Viitattu 1.11.2010. (englanti) (Arkistoitu – Internet Archive)