Willard Van Orman Quine; Roger F. Gibson. V.24. Reference and Modality. Quintessence. Cambridge, Mass: Belknap Press of Harvard University Press. 2008 [2018-05-04]. (原始内容存档于2018-10-21). Here: p.366.
worldcat.org
Willard Van Orman Quine; Roger F. Gibson. V.24. Reference and Modality. Quintessence. Cambridge, Mass: Belknap Press of Harvard University Press. 2008 [2018-05-04]. (原始内容存档于2018-10-21). Here: p.366.