Ratzel, Friedrich (1896). "Legend of Papa and Kaka". The History of Mankind. London: MacMillan. Archived from the original on 6 July 2011. accessed 30 May 2010.
"Oceandots". Archived from the original on December 23, 2010. பார்க்கப்பட்ட நாள் 2012-01-31.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
Ratzel, Friedrich (1896). "Legend of Papa and Kaka". The History of Mankind. London: MacMillan. Archived from the original on 6 July 2011. accessed 30 May 2010.
