売勘場
↑ Athey, Lou (1990年). “The Company Store in Coal Town Culture”. Labor's Heritage 2 (1): pp. 6–23
↑ Fishback, Price V. (1992). “Did Coal Miners 'Owe Their Souls to the Company Store'? Theory and Evidence from the Early 1900s”. Soft Coal, Hard Choices: The Economic Welfare of Bituminous Coal Miners, 1890-1930. p. 131. https://www.questia.com/read/65250311/soft-coal-hard-choices-the-economic-welfare-of-bituminous Chapter 8
↑ Turner, John Kenneth (1910). Barbarous Mexico (Reissued by University of Texas Press, 1969 ed.). Chicago, Kerr. pp. 169–174. https://archive.org/details/barbarousmexico00turnuoft