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Patrick, G. T. W. (1919). The Psychology of Daylight Saving. The Scientific Monthly, 9(5), 385–396.
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Downey, J. W. (1919). Determination of minimum light sense and retinal dark adaptation with presentation of a new type of photometer. American Journal of Ophthalmology, 2(1), 13–20.
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Moore, B. (1920). The Relative Length of Day and Night. Ecology, 1(3), 234–237.
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Rayleigh, L. (1920). Colour of the Night Sky. Nature, 106(2653), 8.
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Rayleigh, L. (1921). The Colour of the Light from the Night Sky. Proceedings of the Royal Society of London. Series A, 99(696), 10–18.
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