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»Hunga Tonga–Hunga Ha'apai«. Global Volcanism Program, National Museum of Natural History. Smithsonian Institution. 7. januar 2015. Arhivirano iz spletišča dne 10. januarja 2015. Pridobljeno 9. januarja 2015.
»Hunga Tonga–Hunga Ha'apai«. Global Volcanism Program, National Museum of Natural History. Smithsonian Institution. 7. januar 2015. Arhivirano iz spletišča dne 10. januarja 2015. Pridobljeno 9. januarja 2015.