| APA | SPDR. (2012, February 15). In Acronym Geek. Retrieved 01:51, February 15, 2012, from http://www.acronymgeek.com/SPDR |
| MLA | "SPDR." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/SPDR>. |
| MHRA | 'SPDR', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/SPDR> [accessed 15 February 2012] |
| Chicago | "SPDR", http://www.acronymgeek.com/SPDR (accessed February 15, 2012). |
| CBE/CSE | SPDR [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/SPDR. |
| Bluebook | SPDR, http://www.acronymgeek.com/SPDR (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPDR, http://www.acronymgeek.com/SPDR (optional description here) (as of Feb. 15, 2012, 01:51). |
| AMA | SPDR. Acronym Geek. February 15, 2012, 01:51. Available at: http://www.acronymgeek.com/SPDR. Accessed February 15, 2012, 01:51. |