MLA

Beaumont, Francis, 1584-1616, Daborne, Robert, d. 1628, Field, Nathan, 1587-1620?, Fletcher, John, 1579-1625, Massinger, Philip, 1583-1640, Webster, John, 1580?-1625?. The Tragedy Of Thierry, King of France, and his brother Theodoret : As it was diuerse times acted at the Blacke-Friers by the Kings Maiesties Seruants. 1621. https://collections.library.yale.edu/catalog/9998626.

APA, 6th edition

Beaumont, Francis, 1584-1616, & Daborne, Robert, d. 1628, & Field, Nathan, 1587-1620?, & Fletcher, John, 1579-1625, & Massinger, Philip, 1583-1640, & Webster, John, 1580?-1625?. (1621)[The Tragedy Of Thierry, King of France, and his brother Theodoret : As it was diuerse times acted at the Blacke-Friers by the Kings Maiesties Seruants]. https://collections.library.yale.edu/catalog/9998626.