MLA

Mason, A. E. W. (Alfred Edward Woodley), 1865-1948. Blanche de Malètroit : a play in one act / founded upon a story by Robert Louis Stevenson by A.E.W. Mason.. [1894?]. https://collections.library.yale.edu/catalog/17378740.

APA, 6th edition

Mason, A. E. W. (Alfred Edward Woodley), 1865-1948. ([1894?])[Blanche de Malètroit : a play in one act / founded upon a story by Robert Louis Stevenson by A.E.W. Mason.]. https://collections.library.yale.edu/catalog/17378740.