Where was the source published? Was it published digitally or in print?
Is it a book, an academic journal or a reputable news source as www.nytimes.com or www.economist.com?
Does it provide complete publication information such as author/s, editor/s, title, date of publication and publisher?
What is the URL of the website?
Avoid using blogs or personal homepage and wiki sites (Wikipedia, Wiktionary, Wikiquotes)
If the URL includes the top-level domain .edu, then that means that it has been published by an academic institution such as university
Common URLs include .gov (government), .org (organizations), .com (commercial sites) and .net (network infrastructures). In academic writing, reputable sites are those with .edu, .gov, .net and .org in URL