Somerset, A. (2002). Basic number skills: Why students fail in math. National Institute for Science & Mathematics Education Development.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিSomerset, Anthony. Basic Number Skills: Why Students Fail in Math. Diliman, Quezon City, Science and Mathematics Education Institute: National Institute for Science & Mathematics Education Development, 2002.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিSomerset, Anthony. Basic Number Skills: Why Students Fail in Math. National Institute for Science & Mathematics Education Development, 2002.
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