Não informado. (1994). Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Mathematics Teaching in the Middle School. Reston, Va: National Council of Teachers of Mathematics, 1994.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Mathematics Teaching in the Middle School. National Council of Teachers of Mathematics, 1994.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.