Christos Marintsis Library

Links

https://www.w3schools.com/ W3Schools

http://inobscuro.com/tutorials/read/16/ php en responsiviteit

https://html5.validator.nu/ html5 validator

https://www.favicon-generator.org/ Favicon & App Icon Generator

validator.w3.org/nu/ html validator

w3.org/ W3

phpcodechecker.com/ php code checker

American Book Center The Red line

Burgerdijk en Niermans Auctioneers of Books and Prints - Booksellers since 1894

Athenaeum AthenaeumBoekhandel

Thoughtco Writing Greek letters on the computer.

codecenter.nl codecenter.nl

phphulp.nl image-resize-script

stackoverflow.com max-height

stackoverflow.com display image full-screen

Wikipedia -(Beeldbank Regionaal Archief Dordrecht) Dirck Jansz. Hoen (fl. 1555-1560) - Achtergrond Algemeen

php.net 4 - dr pain - exif data

text2image.com Ontwerp van het watermerk en Inkscape voor opacity

forums.phpfreaks.com dietkinnie at forums.phpfreaks.com - disable apostrophe

freefontspro.com font download

iloveimg.com online image crop

database.guide Add FULLTEXT

w3docs.com Align placeholder

xmlvalidation.com xml validation - sitemap controle

Geeksengine Eliminating duplicate rows.

Freecodecamp @Media Queries

guru99.com/ Best PHP editor

ChatGPT When you know what you are looking for it helps a lot.

Oasis-open.org Sitemap-XML Caracter Entities