Lua APA (7ú heag.)

Duggal, S. K. (2009). Surveying (3rd ed.). Tata McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

Duggal, S. K. Surveying. 3rd ed. New Delhi: Tata McGraw-Hill, 2009.

Lua MLA (9ú heag.)

Duggal, S. K. Surveying. 3rd ed. Tata McGraw-Hill, 2009.

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