Helvering, Commissioner of Internal Revenue, et al. v. Davis. Great Neck Publishing.
Chicago-čujuhus (17. p.)Helvering, Commissioner of Internal Revenue, Et Al. V. Davis. Great Neck Publishing.
MLA-čujuhus (9. p.)Helvering, Commissioner of Internal Revenue, Et Al. V. Davis. Great Neck Publishing.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.