APA (7th ed.) Citation

Gilbert, C., & Williams, L. (1989). The ABC's of 1-2-3: Release 2.2. Tech Publ..

Chicago Style (17th ed.) Citation

Gilbert, Chris, and Lourie Williams. The ABC's of 1-2-3: Release 2.2. Singapore: Tech Publ., 1989.

MLA (9th ed.) Citation

Gilbert, Chris, and Lourie Williams. The ABC's of 1-2-3: Release 2.2. Tech Publ., 1989.