[12] Ibid.
[13] "The Gospel of Atheism." 1876.
[14] "On the Nature and Existence of God." 1874.
[15] "The True Basis of Morality." 1874.
[16] "Gospel of Atheism." 1876.
[17] "On the Nature and Existence of God." 1874.
[18] "A World without God." 1885.
[19] "The Gospel of Atheism." 1876.
[20] "The Gospels of Christianity and Freethought." 1874.
[21] "A World without God." 1885.