[Doy10] Matt Doyle. Beginning PHP 5.3. Wrox, 2010

[gof94] Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides. Design Patterns: Elements of Reusable Object-Oriented Software, 1st ed. Addison Wesley, 1994

[Gos13] Michelle Gosney. PHP This! The Beginners Guide to Learning Object Oriented PHP, First Edition. 2013

[San13] William Sanders. Learning PHP Design Patterns. O'Reilly, 2013

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