Kinney H. (1961). The book of Popular Science.T.7 (In lần thứ 1.). American: Grolier Incorporated.
শিকাগো স্টাইলে সাইটেশনKinney H. The Book of Popular Science.T.7. In lần thứ 1. American: Grolier Incorporated, 1961.
এমএলএ সাইটেশনKinney H. The Book of Popular Science.T.7. In lần thứ 1. American: Grolier Incorporated, 1961.
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