Phạm Hữu Sách. (1985). Present series: N.1 - 29. Hà Nội: Viện Toán học.
শিকাগো স্টাইলে সাইটেশনPhạm Hữu Sách. Present Series: N.1 - 29. Hà Nội: Viện Toán học, 1985.
এমএলএ সাইটেশনPhạm Hữu Sách. Present Series: N.1 - 29. Hà Nội: Viện Toán học, 1985.
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