APA (7th ed.) Citation

Holub, A. I. (2004). Holub on patterns: Learning design patterns by looking at code. Apress.

Chicago Style (17th ed.) Citation

Holub, Allen I. Holub on Patterns: Learning Design Patterns by Looking at Code. Berkeley: Apress, 2004.

MLA (9th ed.) Citation

Holub, Allen I. Holub on Patterns: Learning Design Patterns by Looking at Code. Apress, 2004.