Dyfyniad APA

Petroski, H. (1999). The book on the bookshelf. Vintage books.

Dyfyniad Arddull Chicago

Petroski, Henry. The Book on the Bookshelf. New York: Vintage books, 1999.

Dyfyniad MLA

Petroski, Henry. The Book on the Bookshelf. Vintage books, 1999.

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