26 C.F.R. §1.856-1
Sec. 856(d)(4) (90 Stat. 1750; 26 U.S.C. 856(d)(4) ); sec. 856(e)(5) (88 Stat. 2113; 26 U.S.C. 856(e)(5) ); sec. 856(f)(2) (90 Stat. 1751; 26 U.S.C. 856(f)(2) ); sec. 856(g)(2) (90 Stat. 1753; 26 U.S.C. 856(g)(2) ); sec. 858(a) (74 Stat. 1008; 26 U.S.C. 858(a) ); sec. 859(c) (90 Stat. 1743; 26 U.S.C. 859(c) ); sec. 859(e) (90 Stat. 1744; 26 U.S.C. 859(e) ); sec. 6001 (68A Stat. 731; 26 U.S.C. 6001 ); sec. 6011 (68A Stat. 732; 26 U.S.C. 6011 ); sec. 6071 (68A Stat. 749, 26 U.S.C. 6071 ); sec. 6091 (68A Stat. 752; 26 U.S.C. 6091 ); sec. 7805 (68A Stat. 917, 26 U.S.C. 7805 ), Internal Revenue Code of 1954