Nigel Buckle. Mathematics Higher Level Core (IB Mathematics) (4th edition.). IBID Press.
Chicago-viite (17. p.)Nigel Buckle. Mathematics Higher Level Core (IB Mathematics). 4th edition. IBID Press.
MLA-viite (9. p.)Nigel Buckle. Mathematics Higher Level Core (IB Mathematics). 4th edition. IBID Press.
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