Blank, Postcard, "Get your Happiness out of your Work or you will never know what real Happiness is," [n.d.].
OH 1/14/13 1p. Hubbard's motto can be found in: "The motto book; being a catalogue of epigrams. East Aurora, N.Y., The Roycrofters, 1914, p. 25."
East Aurora, NY : Roycroft Shops.