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web.archive.org
Annual Tropical Cyclone Report(PDF) (Report). Joint Typhoon Warning Center. p. iii, 218, 240. Archived from the original(PDF) on 20 October 2020. Retrieved 6 January 2014.
Kenneth R. Knapp; Michael C. Kruk; David H. Levinson; Howard J. Diamond; Charles J. Neumann (2010). 1997 Gretelle (1997018S11059). The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data (Report). Bulletin of the American Meteorological Society. Archived from the original on 3 October 2015. Retrieved 7 January 2014.