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* {{cite web|ref=harv| author=National Institute of Standards and Technology | authorlink = National Institute of Standards and Technology | url = http://www.nist.gov/pml/div688/leapseconds.cfm#often | date = 19 March 2012 | title = Frequently asked questions (FAQ)}}
* {{cite web | ref={{sfnref|ITU Radiocommunication Assembly|2002}} |author= ITU Radiocommunication Assembly |url= http://www.itu.int/dms_pubrec/itu-r/rec/tf/R-REC-TF.460-6-200202-I!!PDF-E.pdf |title= Standard-frequency and time-signal emissions |year= 2002 |publisher= International Telecommunications Union |accessdate=2 August 2011}}
* {{cite web | ref = {{sfnRef|Time Service Dept.| c. 2009}} | author = Time Service Dept. | title = Leap Seconds | year = c. 2009 | publisher = United States Naval Observatory | url = http://tycho.usno.navy.mil/leapsec.html | accessdate = 17 July 2011 | archive-date = 2012-05-27 | archive-url = https://www.webcitation.org/67yIZgtef?url=http://tycho.usno.navy.mil/leapsec.html | url-status = dead }}
==Εξωτερικοί σύνδεσμοι==
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