Hodges, D. J., & Greenwood, J. B. (1971). Optical distance measurement. Butterworths.
Lua i Stíl Chicago (17ú heag.)Hodges, Douglas John, agus J. B. Greenwood. Optical Distance Measurement. London: Butterworths, 1971.
Lua MLA (8ú heag.)Hodges, Douglas John, agus J. B. Greenwood. Optical Distance Measurement. Butterworths, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.