APA (7th ed.) Citation

Leffingwell, D., & Widrig, D. (2003). Managing software requirements: A use case approach (2nd ed.). Addison-Wesley.

Chicago Style (17th ed.) Citation

Leffingwell, Dean, and Don Widrig. Managing Software Requirements: A Use Case Approach. 2nd ed. Boston, Massachusetts: Addison-Wesley, 2003.

MLA (9th ed.) Citation

Leffingwell, Dean, and Don Widrig. Managing Software Requirements: A Use Case Approach. 2nd ed. Addison-Wesley, 2003.