Davis, R. E., & Foote, F. S. (1953). Surveying: Theory and practice. New York : McGraw-Hill.
Dyfyniad Arddull ChicagoDavis, Raymond Earl, and Francis S. Foote. Surveying: Theory and Practice. New York : McGraw-Hill, 1953.
Dyfyniad MLADavis, Raymond Earl, and Francis S. Foote. Surveying: Theory and Practice. New York : McGraw-Hill, 1953.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.