Bridgwater William, & Kurtz Seymour. (1963). The columbia encylopedia (Tái bản lần thứ 3.). American: The United States.
শিকাগো স্টাইলে সাইটেশনBridgwater William, এবং Kurtz Seymour. The Columbia Encylopedia. Tái bản lần thứ 3. American: The United States, 1963.
এমএলএ সাইটেশনBridgwater William, এবং Kurtz Seymour. The Columbia Encylopedia. Tái bản lần thứ 3. American: The United States, 1963.
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