ebrary, Inc, Rott, H., & Horák, V. (2003). Possibility and reality: Metaphysics and logic. Ontos Verlag.
芝加哥风格引文ebrary, Inc, Hans Rott, 与 Vítezslav Horák. Possibility and Reality: Metaphysics and Logic. Frankfurt: Ontos Verlag, 2003.
MLA引文ebrary, Inc, et al. Possibility and Reality: Metaphysics and Logic. Ontos Verlag, 2003.
警告：这些引文格式不一定是100％准确.