O'BRIEN, T. FUN FACTS SCIENCE. RUPA BOOKS.
Chicago-čujuhus (17. p.)O'BRIEN, TERRY. FUN FACTS SCIENCE. FACTS; SCIENCE; INFORMATION: RUPA BOOKS.
MLA-čujuhus (9. p.)O'BRIEN, TERRY. FUN FACTS SCIENCE. RUPA BOOKS.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.