The Cecil papers
MLA
Burghley, William Cecil, and Robert Cecil Salisbury. The Cecil Papers. [Ann Arbor, MI]: ProQuest
APA, 7th edition
Burghley, W. Cecil, & Salisbury, R. Cecil. The Cecil papers. [Ann Arbor, MI]: ProQuest
Chicago, 17th edition
Burghley, William Cecil, and Robert Cecil Salisbury. The Cecil papers. [Ann Arbor, MI]: ProQuest