Use CHECKPOINT to answer the following questions: a. What are the principal primary sources? b. What are the principal secondary sources? ..... a. The principal primary sources include: (Select all that apply.) Federal Tax Cases 'C. IRS Rulings and Releases E. IRS Publications G. Treasury Regulations Il Federal Tax Coordinator B. Warren, Gorham and Lamont journals and treatises D. U.S. Tax Treaties in Force F. Master Tax Guide H. Committee Reports 'J. Internal Revenue Code b. The principal secondary sources (editorial materials) include: (Select all that apply.) A. Internal Revenue Code B. United States Tax Reporter OC. U.S. Tax Treaties in Force D. Master Tax Guide E. IRS Rulings and Releases F. Committee Reports G. Federal Tax Coordinator H. Treasury Regulations II. Tax Planning and Practice Guides J. Federal Tax Cases