Thank you for that. If you are mapping from personal knowledge, please also list your survey & local knowledge, as well as aerial imagery. Having said that, unfortunately, the two websites you have listed are both shown as Copyright their owners, so we would need their explicit written permission to copy from them. The Terms of Use on visitdistrikt.rs say that copying in strictly prohibited, so that will definitely be an issue. In addition, due to the terms of their licence, we cannot make use of any Google mapping product for editing in OSM. If you have mapped from these sources, I'm afraid that I'll have to ask you to revert all of the edits that you have made using them.