(2005). Constructivist foundations: CF. Vrije University.
Chicago-čujuhus (17. p.)Constructivist Foundations: CF. Brussels, Belgium: Vrije University, 2005.
MLA-čujuhus (9. p.)Constructivist Foundations: CF. Vrije University, 2005.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.