Forbes, G. (1986). The metaphysics of modality (Reprinted (new as paperback).). Clarendon Press.
芝加哥风格引文Forbes, Graeme. The Metaphysics of Modality. Reprinted (new as paperback). Oxford: Clarendon Press, 1986.
MLA引文Forbes, Graeme. The Metaphysics of Modality. Reprinted (new as paperback). Clarendon Press, 1986.
警告：这些引文格式不一定是100％准确.