20.  Silver, N. C., & Wogalter, M. S. (1989). Broadening the range of signal words. Proceedings of the Human Factors Society, 33, 555-559.

20.  Silver, N. C., & Wogalter, M. S. (1989). Broadening the range of signal words. Proceedings of the Human Factors Society, 33, 555-559.

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