APA (7th ed.) Citation

Preston, J. S. (1969). Photometric standards and the unit of light (2nd ed.). H.M.S.O..

Chicago Style (17th ed.) Citation

Preston, John Silvey. Photometric Standards and the Unit of Light. 2nd ed. London: H.M.S.O., 1969.

MLA (9th ed.) Citation

Preston, John Silvey. Photometric Standards and the Unit of Light. 2nd ed. H.M.S.O., 1969.