D.Helsel Jay, & Jensen Cecil H. (2002). Engineering Drawing and Design (sách photo) (Tái bản lần thứ 6.). American: McGraw -Hill.
শিকাগো স্টাইলে সাইটেশনD.Helsel Jay, এবং Jensen Cecil H. Engineering Drawing and Design (sách Photo). Tái bản lần thứ 6. American: McGraw -Hill, 2002.
এমএলএ সাইটেশনD.Helsel Jay, এবং Jensen Cecil H. Engineering Drawing and Design (sách Photo). Tái bản lần thứ 6. American: McGraw -Hill, 2002.
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