Peter Kreeft (1989). “Three Philosophies of Life: Ecclesiastes--life as Vanity, Job--life as Suffering, Song of Songs--life as Love”, p.149, Ignatius Press
Catholic Church. Pope (1846-1878 : Pius IX), John R. Sheets, Pope Pius IX (1854). “Ineffabilis Deus: Defining the Dogma of the Immaculate Conception : Apostolic Constitution of Pius IX, Issued December 8, 1854”, p.21
Samuel Rutherford (1824). “Joshua redivivus: or, three hundred and fifty two religious letters ... To which is added, the Author's testimony to the covenanted work of reformation, between 1638 and 1649 ... As also, a large preface and postscript ... by the Rev. Mr. McWard. The tenth edition”, p.40