ebrary, Inc, Eco, U., & Marmo, C. (1989). On the medieval theory of signs. J. Benjamins.
芝加哥风格引文ebrary, Inc, Umberto Eco, 与 Costantino Marmo. On the Medieval Theory of Signs. Amsterdam ; Philadelphia: J. Benjamins, 1989.
MLA引文ebrary, Inc, et al. On the Medieval Theory of Signs. J. Benjamins, 1989.
警告：这些引文格式不一定是100％准确.