ebrary, Inc, Cohen, L. E., & Waite-Stupiansky, S. (2012). Play: A polyphony of research, theories, and issues. University Press of America.
Chicago-čujuhus (17. p.)ebrary, Inc, Lynn E. Cohen, juo Sandra Waite-Stupiansky. Play: A Polyphony of Research, Theories, and Issues. Lanham: University Press of America, 2012.
MLA-čujuhus (9. p.)ebrary, Inc, et al. Play: A Polyphony of Research, Theories, and Issues. University Press of America, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.