Banckes, Richard. 1525. (publisher). An Herbal. New York. 1941. (Widener Library)
The Bibliographical Society. Transactions, IX (Oct. 1906–Mar. 1908). New York. p. 121. (Widener Library)
Brown, Ivor. 1962. Shakespeare. New York.
Gerarde, John. 1597. The Herball or General Historie of Plantes. London. (The Arnold Arboretum Copy, Houghton Library.)
Langham, William. 1579. The Garden of Health. London. (The Oakes Ames Library of Economic Botany, Botanical Museum, Harvard University)
Monardes, Doctor D. 1596. Joyful Newse Out of the New-Found Worlde. (Transl. by John Frampton). London. (The Oakes Ames Library of Economic Botany, Botanical Museum, Harvard University)
Rohde, E. S. 1922. The Old English Herbals. London. (Widener Library)
Shakespeare, William. 1952. Shakespeare—The Complete Works. (Ed. by G. B. Harrison) New York.
Turner, William. 1568. Herbal. Collen.