Buckner, Phillip, TUPPER, Sir CHARLES, 14-jild, qaraldi: 17-sentabr 2015-yil{{citation}}: CS1 maint: date format ()
doi.org
Creet, Mario (1990). „Sandford Fleming and Universal Time“. Scientia Canadensis: Canadian Journal of the History of Science, Technology and Medicine. 14-jild, № 1–2. 66–89-bet. doi:10.7202/800302ar.