Sharp, H. O. (1943). Geodetic control surveys. 2d ed (2d ed.). J. Wiley & sons, inc.; Chapman & Hall, limited.
Lua i Stíl Chicago (17ú heag.)Sharp, Howard Oakley. Geodetic Control Surveys. 2d Ed. 2d ed. New York, London: J. Wiley & sons, inc.; Chapman & Hall, limited, 1943.
Lua MLA (8ú heag.)Sharp, Howard Oakley. Geodetic Control Surveys. 2d Ed. 2d ed. J. Wiley & sons, inc.; Chapman & Hall, limited, 1943.
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