Collins, B. L. (1982). The development and evaluation of effective symbol signs. U.S. Dept. of Commerce, National Bureau of Standards : For sale by the Supt. of Docs., U.S. G.P.O.

Collins, Belinda Lowenhaupt. The Development and Evaluation of Effective Symbol Signs. Washington, D.C.: U.S. Dept. of Commerce, National Bureau of Standards : For sale by the Supt. of Docs., U.S. G.P.O, 1982.

Collins, Belinda Lowenhaupt. The Development and Evaluation of Effective Symbol Signs. U.S. Dept. of Commerce, National Bureau of Standards : For sale by the Supt. of Docs., U.S. G.P.O, 1982.