↑ Halsey, William (1969). Louis Shores, ed. Collier's Encyclopedia. 22 (20 ed.). Crowell-Collier Educational Corporation. pp. 266–7. Unknown parameter |coauthors= ignored (|author= suggested) (help)
↑ Nielsen, Kai (2010). "Atheism". Encyclopædia Britannica. สืบค้นเมื่อ 2011-01-26. Atheism, in general, the critique and denial of metaphysical beliefs in God or spiritual beings.... Instead of saying that an atheist is someone who believes that it is false or probably false that there is a God, a more adequate characterization of atheism consists in the more complex claim that to be an atheist is to be someone who rejects belief in God for the following reasons (which reason is stressed depends on how God is being conceived)...
↑ Hepburn, Ronald W. (2005) [1967]. "Agnosticism". In Donald M. Borchert. The Encyclopedia of Philosophy. Vol. 1 (2nd ed.). MacMillan Reference USA (Gale). p. 92. ISBN0028657802. In the most general use of the term, agnosticism is the view that we do not know whether there is a God or not. More than one of |isbn13= และ |isbn= specified (help) (page 56 in 1967 edition)
