Illumination in Industry,by W. J. JONES,M.Sc.,A.M.I.E.E.,Manager of the Lighting Service Bureau,Electric Lamp Manufacturers' Associa tion of Great Britain,Ltd

Hartridge and Lythgoe Investigation, 1925.

Health Leaflet No. II, issued by Health Committee of the Joint Industrial Council of the Printing Trades.

Second Report of the Home Office Departmental Committee on Lighting in Factories and Workshops.

P.E. Shopland , H.M. Inspector of Factories, Illuminating Engineer, May, 1932.

Health Leaflets Nos. 10 and 11, issued by the Health Committee of the Joint Industrial Council of the Printing Trades.

Report of Industrial Fatigue Research Board, No. 20, 1922.