You need to demonstrate that these sources are reliable, which says: "How accepted, high-quality reliable sources use a given source provides evidence, positive or negative, for its reliability and reputation. The more widespread and consistent this use is, the stronger the evidence. For example, widespread citation without comment for facts is evidence of a source's reputation and reliability for similar facts, while widespread doubts about reliability weigh against it." The onus is on the source provider to prove its reliability. I note that the blog doesn't actually support the statement that it cites.