Watson, G. S., Zador, P. L., & Wilks, A. (1981). Helmet use, helmet use laws, and motorcyclist fatalities.
シカゴスタイル引用形Watson, G S., P L. Zador, , A. Wilks. Helmet Use, Helmet Use Laws, and Motorcyclist Fatalities. 1981.
MLA引用形式Watson, G S., P L. Zador, , A. Wilks. Helmet Use, Helmet Use Laws, and Motorcyclist Fatalities. 1981.
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