Não informado. (1969). Journal of Undergraduate Mathematics. Guilford College, Department of Mathematics.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Journal of Undergraduate Mathematics. Greensboro, NC: Guilford College, Department of Mathematics, 1969.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Journal of Undergraduate Mathematics. Guilford College, Department of Mathematics, 1969.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.