Tohutoro APA (7th ed.)
Duggal,S.K. (2013). Surveying (4th ed.). McGraw-Hill.
Tohutoru Kātū Chicago (17th ed.)
Duggal,S.K. Surveying. 4th ed. New Delhi: McGraw-Hill, 2013.
Tohutoro MLA (9th ed.)
Duggal,S.K. Surveying. 4th ed. McGraw-Hill, 2013.
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