MLA

Elizabeth I, Queen of England, 1533-1603. Elizabetha Anglo[rum], id est a intore Angelo[rum] Regina fformosissima & felicissima. Too the disconsolate & retyred spryte, the hermyte of Tybolles. ...: manuscript on vellum. 1591 May 10. https://collections.library.yale.edu/catalog/2005564.

APA, 6th edition

Elizabeth I, Queen of England, 1533-1603. (1591 May 10)[Elizabetha Anglo[rum], id est a intore Angelo[rum] Regina fformosissima & felicissima. Too the disconsolate & retyred spryte, the hermyte of Tybolles. ...: manuscript on vellum]. https://collections.library.yale.edu/catalog/2005564.