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Chicago: U.S. Supreme Court, "Citations," Valvoline Oil Co. v. United States, 308 U.S. 141 (1939) in 308 U.S. 141 Original Sources, accessed July 18, 2025, http://www.originalsources.com/Document.aspx?DocID=D931JWWYY556UXE.
MLA: U.S. Supreme Court. "Citations." Valvoline Oil Co. v. United States, 308 U.S. 141 (1939), in 308 U.S. 141, Original Sources. 18 Jul. 2025. http://www.originalsources.com/Document.aspx?DocID=D931JWWYY556UXE.
Harvard: U.S. Supreme Court, 'Citations' in Valvoline Oil Co. v. United States, 308 U.S. 141 (1939). cited in 1939, 308 U.S. 141. Original Sources, retrieved 18 July 2025, from http://www.originalsources.com/Document.aspx?DocID=D931JWWYY556UXE.