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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)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.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)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.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.