Columbia subject headings:
Derby, William Stanley, Earl of, -1642.
Shakespeare, William, 1564-1616--Authorship.
Harvard subject headings:
Derby, William Stanley, 6th earl of, -1642.
Shakespeare, William, 1564-1616--Authorship.
Princeton subject headings:
Derby, William Stanley, 6th earl of, d. 1642.
Shakespeare, William, 1564-1616--Authorship.