"What shall be the prime meridian for the world?". Report of Committee on standard time and prime meridian, International institute for preserving and perfecting weights and measures. Cleveland, Ohio. 1884.
White, Matthew W. (2004). "Economics of Time Zones"(PDF). m/s. 5. Diarkibkan daripada yang asal(PDF) pada 11 September 2006. Unknown parameter |deadurl= ignored (bantuan)
web.archive.org
White, Matthew W. (2004). "Economics of Time Zones"(PDF). m/s. 5. Diarkibkan daripada yang asal(PDF) pada 11 September 2006. Unknown parameter |deadurl= ignored (bantuan)
wikipedia.org
en.wikipedia.org
White, Matthew W. (2004). "Economics of Time Zones"(PDF). m/s. 5. Diarkibkan daripada yang asal(PDF) pada 11 September 2006. Unknown parameter |deadurl= ignored (bantuan)