"Findings of Fact"(PDF). Arizona Corporation Commission. November 9, 2021. Archived(PDF) from the original on November 12, 2021. Retrieved November 11, 2021.
nationalnanpa.com
"Did you know?"(PDF). NANPA News. September 2010. p. 2. Archived(PDF) from the original on July 21, 2022. Retrieved July 20, 2022.
"2020-2 NRUF and NPA Exhaust Analysis"(PDF). North American Numbering Plan Administrator. October 2020. Archived(PDF) from the original on November 18, 2021. Retrieved November 27, 2021.
"Did you know?"(PDF). NANPA News. September 2010. p. 2. Archived(PDF) from the original on July 21, 2022. Retrieved July 20, 2022.
"2020-2 NRUF and NPA Exhaust Analysis"(PDF). North American Numbering Plan Administrator. October 2020. Archived(PDF) from the original on November 18, 2021. Retrieved November 27, 2021.
"Findings of Fact"(PDF). Arizona Corporation Commission. November 9, 2021. Archived(PDF) from the original on November 12, 2021. Retrieved November 11, 2021.