Warren, S. E. (1894). Elements of plane and solid free-hand geometrical drawing, with lettering: And some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etc ([2d ed.].). Wiley.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Warren, S. Edward. Elements of Plane and Solid Free-hand Geometrical Drawing, with Lettering: And Some Elements of Geometrical Ornamental Design, Including the Principals of Harmonic Angular Ratios, Etc. [2d ed.]. New York: Wiley, 1894.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Warren, S. Edward. Elements of Plane and Solid Free-hand Geometrical Drawing, with Lettering: And Some Elements of Geometrical Ornamental Design, Including the Principals of Harmonic Angular Ratios, Etc. [2d ed.]. Wiley, 1894.
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