"Elsie May Widdowson". Munks Roll – Lives of the Fellows. Royal College of Physicians: Royal College of Physicians. XII. 25 January 2011. Diarsipkan dari versi asli tanggal 17 December 2017. Diakses tanggal 6 May 2018.
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"Elsie May Widdowson". Munks Roll – Lives of the Fellows. Royal College of Physicians: Royal College of Physicians. XII. 25 January 2011. Diarsipkan dari versi asli tanggal 17 December 2017. Diakses tanggal 6 May 2018.