APA (7th ed.) Citation

Leffingwell, D., & Widrig. (2003). Managing software requirements: A use case approach (Second Edition.). Addison Wesley.

Chicago Style (17th ed.) Citation

Leffingwell, Dean, and Widrig. Managing Software Requirements: A Use Case Approach. Second Edition. Boston: Addison Wesley, 2003.

MLA (8th ed.) Citation

Leffingwell, Dean, and Widrig. Managing Software Requirements: A Use Case Approach. Second Edition. Addison Wesley, 2003.