Science activities. [Heldref Publications, etc.].
Chicago-čujuhus (17. p.)Science Activities. [Washington, etc.]: [Heldref Publications, etc.].
MLA-čujuhus (9. p.)Science Activities. [Heldref Publications, etc.].
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.