Chicago: U.S. Supreme Court, "Citations," Zellerbach Paper Co. v. Helvering, 293 U.S. 172 (1934) in 293 U.S. 172 Original Sources, accessed May 11, 2025, http://www.originalsources.com/Document.aspx?DocID=UHA8KC1VDMHJDIE.
MLA: U.S. Supreme Court. "Citations." Zellerbach Paper Co. v. Helvering, 293 U.S. 172 (1934), in 293 U.S. 172, Original Sources. 11 May. 2025. http://www.originalsources.com/Document.aspx?DocID=UHA8KC1VDMHJDIE.
Harvard: U.S. Supreme Court, 'Citations' in Zellerbach Paper Co. v. Helvering, 293 U.S. 172 (1934). cited in 1934, 293 U.S. 172. Original Sources, retrieved 11 May 2025, from http://www.originalsources.com/Document.aspx?DocID=UHA8KC1VDMHJDIE.