Williams, Patricia. “Editorial Preface.” On Opera, by Bernard Williams, Yale University Press, NEW HAVEN; LONDON, 2006, pp. vii-xi, www.jstor.org/stable/j.ctt1nq5nk.3. Accessed 15 July 2020.
Williams, P. (2006). Editorial Preface. In Williams B. (Author), On Opera (pp. Vii-Xi). NEW HAVEN; LONDON: Yale University Press. Retrieved July 15, 2020, from www.jstor.org/stable/j.ctt1nq5nk.3
Williams, Patricia. "Editorial Preface." In On Opera, by Williams Bernard, Vii-Xi. NEW HAVEN; LONDON: Yale University Press, 2006. Accessed July 15, 2020. www.jstor.org/stable/j.ctt1nq5nk.3.
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