Pat O'Brien. (2001). Target Science: Foundation Tier. Oxford University Press.
Chicago-čujuhus (17. p.)Pat O'Brien. Target Science: Foundation Tier. Oxford University Press, 2001.
MLA-čujuhus (9. p.)Pat O'Brien. Target Science: Foundation Tier. Oxford University Press, 2001.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.