| An ISBN or International Standard Book Number is a 13 digit number that identifies published books.
- Has the author written several articles on the topic, and do they have the credentials to be an expert in their field?
- Can you contact them? Do they have social media profiles?
- Have other credible individuals referenced this source or author?
- Book: What have reviews said about it?
- What do you know about the publisher/sponsor? Are they well-respected?
- Do they take responsibility for the content? Are they selective about what they publish?
- Take a look at their other content. Do these other articles generally appear credible?
- Does the author or the organization have a bias? Does bias make sense in relation to your argument?
- Is the purpose of the content to inform, entertain, or to spread an agenda? Is there commercial intent?
- Are there ads?
- When was the source published or updated? Is there a date shown?
- Does the publication date make sense in relation to the information presented to your argument?
- Does the source even have a date?
- Was it reproduced? If so, from where?
- If it was reproduced, was it done so with permission? Copyright/disclaimer included?