| APA | ERK. (2012, February 14). In Acronym Geek. Retrieved 06:27, February 14, 2012, from http://www.acronymgeek.com/ERK |
| MLA | "ERK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ERK>. |
| MHRA | 'ERK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ERK> [accessed 14 February 2012] |
| Chicago | "ERK", http://www.acronymgeek.com/ERK (accessed February 14, 2012). |
| CBE/CSE | ERK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ERK. |
| Bluebook | ERK, http://www.acronymgeek.com/ERK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ERK, http://www.acronymgeek.com/ERK (optional description here) (as of Feb. 14, 2012, 06:27). |
| AMA | ERK. Acronym Geek. February 14, 2012, 06:27. Available at: http://www.acronymgeek.com/ERK. Accessed February 14, 2012, 06:27. |