User talk:Theodorus20

Welcome!
Hi, Theodorus20. Welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Our intro page contains a lot of helpful material for new users—please check it out! If you need help, visit Questions or.

Identifying Reliable Sources
Hello, I'm Nikthestunned. I noticed that you made a change to an article, Blind contour drawing, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you.