Thomas, W. N. (1961). Surveying (5th ed.). ELBS & Edward Arnold.
Cita Chicago (17th ed.)Thomas, W. Norman. Surveying. 5th ed. London: ELBS & Edward Arnold, 1961.
Cita MLA (9th ed.)Thomas, W. Norman. Surveying. 5th ed. ELBS & Edward Arnold, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.