Rujukan Hari_Pi

  1. ↑ Landau, Elizabeth (March 12, 2010). "On Pi Day, one number 'reeks of mystery'" (dalam bahasa Inggeris). CNN. Dicapai pada March 14, 2018.
  2. ↑ Bellos, Alex (March 14, 2015). "Pi Day 2015: a sweet treat for maths fans". theguardian.com. Dicapai pada March 14, 2016.
  3. ↑ Program on Sveriges Radio – Swedish national radio company Read March 14, 2015
  4. ↑ United States. Cong. House. Supporting the designation of Pi Day, and for other purposes. 111th Cong. Library of Congress.
  5. ↑ "International Day of Mathematics". UNESCO (dalam bahasa Inggeris). 4 March 2020.
  6. ↑ Rousseau, Christiane (1 September 2019). "International Day of Mathematics" (PDF). Notices of the American Mathematical Society. 66 (08): 1. doi:10.1090/noti1928.
  7. ↑ "Pi Approximation Day is celebrated today". Today in History. Verizon Foundation. Diarkib daripada yang asal pada December 1, 2010. Dicapai pada January 30, 2011.