MLA

Bellamy, Dodie. The Letters of Mina Harker Source Materials. 1992. https://collections.library.yale.edu/catalog/16764257.

APA, 6th edition

Bellamy, D. (1992). The Letters of Mina Harker Source Materials [Correspondence, Manuscripts, Sticky notes]. https://collections.library.yale.edu/catalog/16764257.