Ballard, Robert D. “Foreword.” Volcanoes in Human History: The Far-Reaching Effects of Major Eruptions, by Jelle Zeilinga De Boer and Donald Theodore Sanders, Princeton University Press, Princeton; Oxford, 2002, pp. ix-x, www.jstor.org/stable/j.ctt7s08n.3. Accessed 19 Apr. 2021.
Ballard, R. (2002). Foreword. In De Boer J. & Sanders D. (Authors), Volcanoes in Human History: The Far-Reaching Effects of Major Eruptions (pp. Ix-X). Princeton; Oxford: Princeton University Press. Retrieved April 19, 2021, from http://www.jstor.org/stable/j.ctt7s08n.3
Ballard, Robert D. "Foreword." In Volcanoes in Human History: The Far-Reaching Effects of Major Eruptions, by De Boer Jelle Zeilinga and Sanders Donald Theodore, Ix-X. Princeton; Oxford: Princeton University Press, 2002. Accessed April 19, 2021. http://www.jstor.org/stable/j.ctt7s08n.3.
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