MLA

Browne, John, approximately 1608-1691. "Instructions for our Cousin and councellor Robert Earl of Essex E. Marshall of England, etc. Lieutenant and Governor general of the Kingdom of Ireland Given at Richmond the 29th of March 1599".. Box 1. [n.d.]. https://collections.library.yale.edu/catalog/31905909.

APA, 6th edition

Browne, John, approximately 1608-1691. (["Box 1"])([n.d.])["Instructions for our Cousin and councellor Robert Earl of Essex E. Marshall of England, etc. Lieutenant and Governor general of the Kingdom of Ireland Given at Richmond the 29th of March 1599".]. https://collections.library.yale.edu/catalog/31905909.