Government Reports and Peer-Reviewed Studies Official vetted reports from international government bodies (such as the United Nations and the European Union), foreign governments (federal level agencies such as France’s Ministry of Justice, South Africa’s Ministry of Health, or Japan’s office of the Prime Minister), and US government agencies (state, federal, and quasi-government agencies including the Smithsonian Institution, the National Academy of Sciences, and Legal Services Corporation) and peer-reviewed studies from academic journals (such as Science, Nature, New England Journal of Medicine, etc.) tend to have multiple editorial and ideological filters, and they normally receive rigorous review from experts before being formally issued.
Peer reviewed journal - "PNAS is one of the world's most-cited multidisciplinary scientific serials. Since its establishment in 1914, it continues to publish cutting-edge research reports, commentaries, reviews, perspectives, colloquium papers, and actions of the Academy. Coverage in PNAS spans the biological, physical, and social sciences. PNAS is published weekly in print, and daily online in PNAS Early Edition."