Duggal,S.K. (2013). Surveying (4th ed.). McGraw-Hill.
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Dyfyniad Arddull Chicago
Duggal,S.K. Surveying. 4th ed. New Delhi: McGraw-Hill, 2013.
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Dyfyniad MLA
Duggal,S.K. Surveying. 4th ed. McGraw-Hill, 2013.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.