NARAYANA, K. L. (1992). ENGINEERING GRAPHICS. TATA MC-GRAW HILL PUBLISHING CO.LTD.
Lua i Stíl Chicago (17ú heag.)NARAYANA, K L. ENGINEERING GRAPHICS. NEW DELHI: TATA MC-GRAW HILL PUBLISHING CO.LTD, 1992.
Lua MLA (9ú heag.)NARAYANA, K L. ENGINEERING GRAPHICS. TATA MC-GRAW HILL PUBLISHING CO.LTD, 1992.
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