APA (7th ed.) Citation

Callahan, M., & Anis, N. (1991). XTree made easy. Osborne McGraw-Hill.

Chicago Style (17th ed.) Citation

Callahan, Mike, and Nick Anis. XTree Made Easy. Berkely, Calif: Osborne McGraw-Hill, 1991.

MLA (9th ed.) Citation

Callahan, Mike, and Nick Anis. XTree Made Easy. Osborne McGraw-Hill, 1991.