| APA | PNAS. (2012, February 17). In Acronym Geek. Retrieved 00:38, February 17, 2012, from http://www.acronymgeek.com/PNAS |
| MLA | "PNAS." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PNAS>. |
| MHRA | 'PNAS', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PNAS> [accessed 17 February 2012] |
| Chicago | "PNAS", http://www.acronymgeek.com/PNAS (accessed February 17, 2012). |
| CBE/CSE | PNAS [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PNAS. |
| Bluebook | PNAS, http://www.acronymgeek.com/PNAS (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PNAS, http://www.acronymgeek.com/PNAS (optional description here) (as of Feb. 17, 2012, 00:38). |
| AMA | PNAS. Acronym Geek. February 17, 2012, 00:38. Available at: http://www.acronymgeek.com/PNAS. Accessed February 17, 2012, 00:38. |