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National Institute of Standards and Technology (18 January 2011). "Frequently asked questions (FAQ)". Dicapai 17 Julai 2011.
"How NTP Works". NTP: The Network Time Protocol. 28 Julai 2011. See heading "NTP Timescale and Data Formats".
ITU Radiocommunication Assembly (2002). "Standard-frequency and time-signal emissions" (PDF). Kesatuan Telekomunikasi Antarabangsa. Dicapai 2 Ogos 2011.
Jabatan Perkhidmatan Masa A.S (2016). "Leap Seconds". United States Naval Observatory. Dicapai 4 Jun 2017.

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