WICK'S, W. (1998). OPTICAL TRICKS. SCHOLASTIC INS.
Chicago-čujuhus (17. p.)WICK'S, WALTER. OPTICAL TRICKS. SCHOLASTIC INS, 1998.
MLA-čujuhus (9. p.)WICK'S, WALTER. OPTICAL TRICKS. SCHOLASTIC INS, 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.