Reliable sources are those who have been proven to be correct and has been reviewed and verified as right. In books, the reliable sources are those that are have reviews by the expert and with the ISBN or International Standard Book Number. It signifies that the book has undertaken a review from different officials and experts on that matter. Next, in internet, it can be reliable if the information is match from any materials.
A reliable source is one that provides a thorough, well-reasoned theory, argument, discussion, etc. based on strong evidence. Scholarly, peer-reviewed articles or books -written by researchers for students and researchers. ... These sources may provide some of their articles online for free.
by responding that your information is wrong or unreliable and should edit it