Helen Molesworth, Property from the Collection of Her Royal Highness The Princess Margaret, Countess of Snowdon. Christie's Auction House, Jewellery Department, London, 2006. Auction of the Property of HRH Princess Margaret
"No. 15"(PDF). New Zealand Gazette. 3 March 1955. hlm. 332. Diarsipkan dari versi asli(PDF) tanggal 9 October 2022.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"No. 15"(PDF). New Zealand Gazette. 3 March 1955. hlm. 332. Diarsipkan dari versi asli(PDF) tanggal 9 October 2022.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Royal Family Orders". Official website of the British monarchy. Royal Household. Diarsipkan dari versi asli tanggal 7 March 2013. Diakses tanggal 13 April 2016.
royal.uk
Goodey, Emma (21 December 2015). "Princess Margaret". The Royal Family. Diakses tanggal 16 December 2020.
"Henry John Forbes Simson 1872‐1932". BJOG: An International Journal of Obstetrics and Gynaecology. December 1932. Diarsipkan dari versi asli tanggal 2019-06-26. Diakses tanggal 12 June 2018.
"Royal Family Orders". Official website of the British monarchy. Royal Household. Diarsipkan dari versi asli tanggal 7 March 2013. Diakses tanggal 13 April 2016.
"Henry John Forbes Simson 1872‐1932". BJOG: An International Journal of Obstetrics and Gynaecology. December 1932. Diarsipkan dari versi asli tanggal 2019-06-26. Diakses tanggal 12 June 2018.