APA (7th ed.) Citation

United States. Internal Revenue Service. (2003). Volunteer assistor's guide. Dept. of the Treasury, Internal Revenue Service.

Chicago Style (17th ed.) Citation

United States. Internal Revenue Service. Volunteer Assistor's Guide. [Washington, D.C.]: Dept. of the Treasury, Internal Revenue Service, 2003.

MLA (9th ed.) Citation

United States. Internal Revenue Service. Volunteer Assistor's Guide. Dept. of the Treasury, Internal Revenue Service, 2003.