Library of Congress. Congressional Research Service & ProQuest (Firm). (2004). IRS Guidelines for Political Advocacy by Exempt 501(c) Organizations: Revenue Ruling 2004-6. [publisher not identified].
Chicago Style (17th ed.) CitationLibrary of Congress. Congressional Research Service and ProQuest (Firm). IRS Guidelines for Political Advocacy by Exempt 501(c) Organizations: Revenue Ruling 2004-6. [Place of publication not identified]: [publisher not identified], 2004.
MLA (9th ed.) CitationLibrary of Congress. Congressional Research Service and ProQuest (Firm). IRS Guidelines for Political Advocacy by Exempt 501(c) Organizations: Revenue Ruling 2004-6. [publisher not identified], 2004.
Warning: These citations may not always be 100% accurate.