(en) Bob Gulden, Deep caves of the World, Journal of Cave and Karst Studies, , 2 p. (lire en ligne)
(en) Bob Gulden, Long Caves of the United States, Journal of Cave and Karst Studies, , 2 p. (lire en ligne)
(en) Kevin Allred et Carlene Allred, « Development and Morphology of Kazumura Cave », Journal of Cave and Karst Studies, vol. 59, , p. 67-80 (lire en ligne [PDF])
dukelabs.com
(en) Charles Merguerian et Steven Okulewicz, Geology of Hawaii, Hofstra University Geology Department, , 140 p. (lire en ligne), p. 105-107
(en) 2000 Districts Hawaii County, Office of Planning, Department of Business, Economic Development and Tourism, State of Hawaii, , 1 p. (présentation en ligne, lire en ligne)