Internal revenue code :
income, employment, estate and gift tax provisions as of June 18, 1981.

APA Citation

United States., Commerce Clearing House. (1981). Internal revenue code: income, employment, estate and gift tax provisions as of June 18, 1981. Chicago: Commerce Clearing House.

MLA Citation

United States, and Commerce Clearing House. Internal Revenue Code: Income, Employment, Estate And Gift Tax Provisions As of June 18, 1981. Chicago: Commerce Clearing House, 1981.

Warning: These citations may not always be complete (especially for serials).