APA استشهاد

Eco, U., & McEwen, A. (2006). Turning back the clock. Harvillsecker.

استشهاد بنمط شيكاغو

Eco, Umberto, و Alastair McEwen. Turning Back the Clock. London: Harvillsecker, 2006.

MLA استشهاد

Eco, Umberto, و Alastair McEwen. Turning Back the Clock. Harvillsecker, 2006.