Argerich, L. (2002). Professional PHP 4. Wrox Press.
Lua i Stíl Chicago (17ú heag.)Argerich, Luis. Professional PHP 4. Birmingham, UK: Wrox Press, 2002.
Lua MLA (9ú heag.)Argerich, Luis. Professional PHP 4. Wrox Press, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.