Otto, Peter (9 October 2008). "The Sadleir-Black Collection". Gothic Fiction - Introduction. Adam Matthews Publications. Archived from the original on 2008-10-09. Retrieved 25 Feb 2022.
Otto, Peter (9 October 2008). "The Sadleir-Black Collection". Gothic Fiction - Introduction. Adam Matthews Publications. Archived from the original on 2008-10-09. Retrieved 25 Feb 2022.