Ng, Chiu-king. How tidal forces cause ocean tides in the equilibrium theory. Physics Education. March 2015, 50 (2): 159–164. doi:10.1088/0031-9120/50/2/159.
Tide forecasts. New Zealand: National Institute of Water & Atmospheric Research. [2008-11-07]. （原始内容存档于2008-10-14）. Including animations of the M2, S2 and K1 tides for New Zealand.
Types and causes of tidal cycles. U S National Oceanic and Atmospheric Administration (NOAA) National Ocean Service（Education section）. [2009-09-26]. （原始内容存档于2018-10-16）.
Tide tables usually list mean lower low water (mllw, the 19 year average of mean lower low waters), mean higher low water (mhlw), mean lower high water (mlhw), mean higher high water (mhhw), as well as perigean tides. These are mean in the sense that they are predicted from mean data. Glossary of Coastal Terminology: H–M （页面存档备份，存于互联网档案馆）, Washington Department of Ecology, State of Washington (checked 5 April 2007).
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Tide tables usually list mean lower low water (mllw, the 19 year average of mean lower low waters), mean higher low water (mhlw), mean lower high water (mlhw), mean higher high water (mhhw), as well as perigean tides. These are mean in the sense that they are predicted from mean data. Glossary of Coastal Terminology: H–M （页面存档备份，存于互联网档案馆）, Washington Department of Ecology, State of Washington (checked 5 April 2007).
Types and causes of tidal cycles. U S National Oceanic and Atmospheric Administration (NOAA) National Ocean Service（Education section）. [2009-09-26]. （原始内容存档于2018-10-16）.
Tide forecasts. New Zealand: National Institute of Water & Atmospheric Research. [2008-11-07]. （原始内容存档于2008-10-14）. Including animations of the M2, S2 and K1 tides for New Zealand.
