Richardson, K. (1998). Models of cognitive development. Psychology Press.
Chicago-čujuhus (17. p.)Richardson, Ken. Models of Cognitive Development. Hove, East Sussex, UK: Psychology Press, 1998.
MLA-čujuhus (9. p.)Richardson, Ken. Models of Cognitive Development. Psychology Press, 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.