トラック・システム
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Cobbett, William. Rural Rides - プロジェクト・グーテンベルク
google.com/books?id=etFGvcK-dYwC 2008年5月31日閲覧。
Lauchheimer, Malcolm H. (1919), “The Terms of Employment (in the Labor Law of Maryland)”, Johns Hopkins University Studies in Historical and Political Science, XXXVII, Baltimore: The Johns Hopkins Press, pp. 106–112, https://books.google.com/books?id=lNsOAAAAYAAJ
M'Culloch, J. R. (1852), “Truck System”, in Vethake, Henry, A Dictionary, Practical, Theoretical, and Historical, of Commerce and Commercial Navigation., II, Philadelphia: A. Hart, pp. 684–86, https://books.google.com/books?id=tGpCAAAAIAAJ
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