1. Langenberg, D. N. and Taylor, B. N., eds. Proc. Int. Conf. Precision Measurement and Fundamental Constants. Proceedings of the International Conference held at the National Bureau of Standards. August1970, Gaithersburg. pp.73–82. This volume contains critical reviews of many atomic constants, including an article on the Rydberg constant by Series, G. W. NBS Spec. Publ. 343, US. Dept. of Commerce
2. Determination ofeh, Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants