(1985). Committee on Engineering Surveying. Engineering Surveying Manual. ASCE.
Dyfyniad Arddull ChicagoCommittee on Engineering Surveying. Engineering Surveying Manual. New York: ASCE, 1985.
Dyfyniad MLACommittee on Engineering Surveying. Engineering Surveying Manual. ASCE, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.