OLLIVER, J., & CLENDINNING, J. (1978). Principles of surveying Vol.1: Plane surveying. Van Nostrand Reinhold Co.
Lua i Stíl Chicago (17ú heag.)OLLIVER, J.G, agus J. CLENDINNING. Principles of Surveying Vol.1: Plane Surveying. New York: Van Nostrand Reinhold Co, 1978.
Lua MLA (9ú heag.)OLLIVER, J.G, agus J. CLENDINNING. Principles of Surveying Vol.1: Plane Surveying. Van Nostrand Reinhold Co, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.