Former Presidents, Istana Singapore: Office of the President of the Republic of Singapore, 28 April 2006, archived from the original on 1 August 2008, பார்க்கப்பட்ட நாள் 24 January 2009.
President S R Nathan, Istana Singapore: Office of the President of the Republic of Singapore, 4 May 2006, archived from the original on 22 August 2008, பார்க்கப்பட்ட நாள் 24 January 2009.
Former Presidents, Istana Singapore: Office of the President of the Republic of Singapore, 28 April 2006, archived from the original on 1 August 2008, பார்க்கப்பட்ட நாள் 24 January 2009.
President S R Nathan, Istana Singapore: Office of the President of the Republic of Singapore, 4 May 2006, archived from the original on 22 August 2008, பார்க்கப்பட்ட நாள் 24 January 2009.