MLA

Sjaelland, Denmark: Logbok. 0AD. https://collections.library.yale.edu/catalog/11684587.

APA, 6th edition

Sjaelland, Denmark: logbok. (0 C.E.). [Manuscripts, Medieval Denmark 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/11684587.