(1988). Advanced logo: A language for learning / Michael Friendly.
Chicago-čujuhus (17. p.)Advanced Logo: A Language for Learning / Michael Friendly. 1988.
MLA-čujuhus (9. p.)Advanced Logo: A Language for Learning / Michael Friendly. 1988.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.