Wade, Ira O.. "Frontmatter". Intellectual Development of Voltaire, Princeton: Princeton University Press, 1969, pp. i-vi. https://doi.org/10.1515/9781400877829-fm
Wade, I. (1969). Frontmatter. In Intellectual Development of Voltaire (pp. i-vi). Princeton: Princeton University Press. https://doi.org/10.1515/9781400877829-fm
Wade, Ira O.. "Frontmatter" In Intellectual Development of Voltaire, i-vi. Princeton: Princeton University Press, 1969. https://doi.org/10.1515/9781400877829-fm