Pfleiderer, Otto. Das Urchristentum, seine Schriften und Lehren in geschichtlichem Zusammenhang beschrieben (2nd ed., Berlin, 1902, 2 vols.) (English translation, Primitive Christianity, vols. i. and ii. (vol. i. of original), London, 1906, 1909);
Die Entstehung des Urchristentums (Munich, 1905) (English translation, Christian Origins, by D. A. Huebsch, London, 1905), [229], [293], [309], [311-313], [384]
Plank. Geschichte des Christentums (Göttingen, 1818), [34]
Pressel, Theodor. Leben Jesu Christi (1857), [101]
Pressensé, Edmond Dehoult de. Jésus-Christ, son temps, sa vie, son œuvre (Paris, 1865) (English translation, Jesus Christ, His Times, His Life, His Work, by A. Harwood, 3rd ed., London, 1869);
L'École critique et Jésus-Christ, à propos de la vie de Jésus de M. Renan, [180], [189]
Quinet, Edgar, [108]
Rauch, C. Jeschua ben Joseph (Deichert, 1899), [326]
Régla, Paul de. Jesus von Nazareth, (German by A. Just, Leipzig, 1894), [294], [325]
Reimarus, Hermann Samuel. Von dem Zwecke Jesu und seiner Jünger (published by Lessing, Brunswick, 1778) (English translation, The Object of Jesus and His disciples, as seen in the New Testament, edited by A. Voysey, 1879), [4], [9], [10], [13-26], [75], [94], [107], [120], [159], [166], [172], [221], [239], [264], [303], [312], [319], [345], [365]