APA (7th ed.) Citation

Ledgard, H., & Tauer, J. Professional software. Addison-Wesley.

Chicago Style (17th ed.) Citation

Ledgard, Henry, and John Tauer. Professional Software. Reading, Mass. [u.a.]: Addison-Wesley.

MLA (9th ed.) Citation

Ledgard, Henry, and John Tauer. Professional Software. Addison-Wesley.