Proceedings of the National Academy of Sciences of the United States of America
Proceedings of the National Academy of Sciences of the United States of America (often abbreviated PNAS or PNAS USA) is a peer-reviewed multidisciplinary scientific journal. It is the official journal of the National Academy of Sciences, published since 1915, and publishes original research, scientific reviews, commentaries, and letters. According to "Journal Citation Reports", the journal has a 2020 impact factor of 11.205. "PNAS" is the second most cited scientific journal, with more than 1.9 million cumulative citations from 2008 to 2018. In the mass media, "PNAS" has been described variously as "prestigious", "sedate", "renowned", and "high impact".