Should newspaper reporters be required to reveal their sources?

I think that the newspaper reporters should be reveal their sources. Sometime when I read the newspaper and there is no sources it make me wonder if I can trust this newspaper. I want to read something that I can trust. Ask for me I want to know where the information is come from. Sometime when I see a newspaper without sources it's make me don't want to read them and I will not pay for the newspaper without sources.