Nigel Buckle. Mathematics Higher Level Core (IB Mathematics) (4th edition.). IBID Press.
Chicago-čujuhus (17. p.)Nigel Buckle. Mathematics Higher Level Core (IB Mathematics). 4th edition. IBID Press.
MLA-čujuhus (9. p.)Nigel Buckle. Mathematics Higher Level Core (IB Mathematics). 4th edition. IBID Press.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.