Theodore Parker (1853). “Two Sermons Preached Before the Twenty-eighth Congregational Society in Boston: On the 14th and 21st of November, 1852, on Leaving Their Old and Entering a New Place of Worship”, p.58
William Batchelder Greene (1872). “The blazing star; with an appendix treating of the Jewish Kabbala, also a tract on the philosophy of H. Spencer, and one on New-England transcendentalism”, p.4