APA (7th ed.) Citation

Schäfer, P. (2003). Preface. The Bar Kokhba War reconsidered, 7-20.

Chicago Style (17th ed.) Citation

Schäfer, Peter. "Preface." The Bar Kokhba War Reconsidered 2003: 7-20.

MLA (8th ed.) Citation

Schäfer, Peter. "Preface." The Bar Kokhba War Reconsidered, 2003, pp. 7-20.