^R. V. Pound and G. A. Rebka, Jr.: Apparent Weight of Photons. In: Physical Review Letters. Vol. 4, 1. April 1960, pp. 337–341
^Robert V. Pound: Weighing Photons. In: Physics in Perspective. Vol. 2, 2000, pp. 224–268, and Vol. 3, 2001, pp. 4–51
^Presidential Address on the Award of the Eddington Medal to Professor R. V. Pound and Dr. G. A. Rebka. In: Quarterly Journal of the Royal Astronomical Society. Vol. 6, pp. 123–124
