found: Pacific Maps Pty. Ltd. Nuku'alofa, 1980?
found: Nukuʼalofa & environs, 1992?
found: Webster's new geog. dict., 1980(Nukualofa, seaport of N coast of Tongatapu I., [capital] of Tonga)
found: BGN 1/30/85(Nuku'alofa, ppl, 21°08ʹS 175°12ʹW; variants: Nukualofa, Nukalofa)
found: GEOnet, Aug. 21, 2002(Nukuʻalofa, pplc, 21°08ʹS 175°12ʹW, Tongatapu; variants: Nukuʻaloia, Nukalofa, Niukalofa)
found: Col. gaz.(Nukuʼalofa, town, [capital] and chief port of Kingdom of Tonga, on the N coast of Tongatapu isl.)
found: MW web. geog.(Nukuʼalofa, seaport on N coast of Tongatapu I., [capital] of Tonga)
found: Agricultural marketing in the South Pacific, 1992:t.p. (Nukulalofa, Kingdom of Tonga)
found: The world factbook, via WWW, August 25, 2015(under Tonga: capital: Nuku'alofa; geographic coordinates: 21 08 S, 175 12 W)
found: Wikipedia, August 25, 2015(Nuku'alofa; capital of the Kingdom of Tonga; located on the north coast of the island of Tongatapu, in the southernmost island group of Tonga; first mention of Nuku'alofa spelled as Noogoollefa; 21°8ʹ0ʺS 175°12ʹ0ʺW)
found: GEOnet names server, August 25, 2015(Nukuʻalofa (approved); capital of a political entity; variants: Niukalofa; Nukalofa; Nukuʻaloia; Tonga, first-order administrative division: Tongatapu; 21°08ʹ22ʺS, 175°12ʹ06ʺW (-21.139384, -175.201798))