References
- Warren J. Luzadder and Jon M. Duff (2008), Fundamentals of Engineering Drawing, 11th ed., Prentice Hall
- Thomas E. French and Charles J. Vierck (2008), Engineering Drawing and Graphic Technology, 14th ed., McGraw-Hill
- K. Venugopal (2008), Engineering Drawing, 3rd ed., New Age International
- N.D. Bhatt (2008), Elementary Engineering Drawing, 48th ed., Charotar Publishing House
- Warren J. Luzadder (2008), Basic Graphics, 2nd ed., Prentice Hall