APA (7th ed.) Citation

United States. Internal Revenue Service. (1978). Vita course book update. The Service.

Chicago Style (17th ed.) Citation

United States. Internal Revenue Service. Vita Course Book Update. [Washington, D.C.?]: The Service, 1978.

MLA (9th ed.) Citation

United States. Internal Revenue Service. Vita Course Book Update. The Service, 1978.

Warning: These citations may not always be 100% accurate.