Ric Pimentel; Terry Wall. (2004). Checkpoint Maths Book 1 (Modular Maths for Edexcel). "Trans-Atlantic Publications, Inc.".
Chicago-čujuhus (17. p.)Ric Pimentel; Terry Wall. Checkpoint Maths Book 1 (Modular Maths for Edexcel). "Trans-Atlantic Publications, Inc.", 2004.
MLA-čujuhus (9. p.)Ric Pimentel; Terry Wall. Checkpoint Maths Book 1 (Modular Maths for Edexcel). "Trans-Atlantic Publications, Inc.", 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.