Dyfyniad APA
Wirshing, J. R., & Wirshing, R. H. (1985). Schaum's Outline of Theory and Problems of Introductory Surveying. McGraw-Hill.
Dyfyniad Arddull Chicago
Wirshing, James R., and Roy H. Wirshing. Schaum's Outline of Theory and Problems of Introductory Surveying. New York: McGraw-Hill, 1985.
Dyfyniad MLA
Wirshing, James R., and Roy H. Wirshing. Schaum's Outline of Theory and Problems of Introductory Surveying. McGraw-Hill, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.