De Vries, Hugo (1910) [German language edition published in 1889], Intracellular Pangenesis, trans. Cager, C. Stuart, Boston: Open Court, pp. 3, 5, OL7215909M.
Written as pangene in the German text. De Vries, Hugo (1889), Intracellulare Pangenesis (in German), Jena: von Guetav Fischer, p. 6, OL7227630M.
Weismann, August (1893), The Germ-Plasm. A Theory of Heredity, trans. Parker, W. Newton, New York: Charles Scribner's Sons, pp. 3–4, OL20512798M