BIRCHALL DAVID. (2002). FUTURE PROOFING. CAPSTONE.
Chicago-čujuhus (17. p.)BIRCHALL DAVID. FUTURE PROOFING. U K: CAPSTONE, 2002.
MLA-čujuhus (9. p.)BIRCHALL DAVID. FUTURE PROOFING. CAPSTONE, 2002.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.