WHITEHEAD, N. E., J. Hunt, D. Leslie, and P. Rankin The elemental content of Niue Island soils as an indicator of their origin. New Zealand Journal of Geology & Geophysics, June 1993, s. 243–255. Dostupné online [cit. 2007-12-03]. DOI: 10.1080/00288306.1993.9514572.
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Achievements for Niue [online]. The European Commission's Delegation to the Pacific, [cit. 2009-07-31]. Dostupné online. Archivované 2012-02-26 z originálu.
WHITEHEAD, N. E., J. Hunt, D. Leslie, and P. Rankin The elemental content of Niue Island soils as an indicator of their origin. New Zealand Journal of Geology & Geophysics, June 1993, s. 243–255. Dostupné online [cit. 2007-12-03]. DOI: 10.1080/00288306.1993.9514572.
Achievements for Niue [online]. The European Commission's Delegation to the Pacific, [cit. 2009-07-31]. Dostupné online. Archivované 2012-02-26 z originálu.