APA (7th ed.) Citation

(1989). The Software users' year book 1990. VNU Business Publications.

Chicago Style (17th ed.) Citation

The Software Users' Year Book 1990. [London: VNU Business Publications, 1989.

MLA (9th ed.) Citation

The Software Users' Year Book 1990. VNU Business Publications, 1989.

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