Ric Pimentel; Terry Wall. (2004). Checkpoint Maths Book 1 (Modular Maths for Edexcel). "Trans-Atlantic Publications, Inc.".
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRic Pimentel; Terry Wall. Checkpoint Maths Book 1 (Modular Maths for Edexcel). "Trans-Atlantic Publications, Inc.", 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRic Pimentel; Terry Wall. Checkpoint Maths Book 1 (Modular Maths for Edexcel). "Trans-Atlantic Publications, Inc.", 2004.
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