Hanson, R. D. (1969). The Venezuela earthquake, July 29, 1967: By R. D. Hanson and Henry J. Degenkolb. American Iron and Steel Institute.
Chicago-viite (17. p.)Hanson, Robert D. The Venezuela Earthquake, July 29, 1967: By R. D. Hanson and Henry J. Degenkolb. New York: American Iron and Steel Institute, 1969.
MLA-viite (9. p.)Hanson, Robert D. The Venezuela Earthquake, July 29, 1967: By R. D. Hanson and Henry J. Degenkolb. American Iron and Steel Institute, 1969.
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