Schofield, W. (1993). Engineering surveying: Theory and examination problems for students (4th ed.). Butterworth-Heinemann.
Lua i Stíl Chicago (17ú heag.)Schofield, W. Engineering Surveying: Theory and Examination Problems for Students. 4th ed. Oxford [England]: Butterworth-Heinemann, 1993.
Lua MLA (9ú heag.)Schofield, W. Engineering Surveying: Theory and Examination Problems for Students. 4th ed. Butterworth-Heinemann, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.