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Walker, G.T. Review of "Climate through the Ages. A Study of Climatic Factors and Climatic Variations" by C. E. P. Brooks. Quarterly Journal of the Royal Meteorological Society. 1927, 53: 321–323. doi:10.1002/qj.49705322311.
Walker, G. T. Correlation in seasonal variations of weather. IX. A further study of world weather. Memoirs of the Indian Meteorological Department. 1924, 24: 275–332. From p. 283: "There is also a slight tendency two-quarters later towards an increase of pressure in S. America and of Peninsula [i.e., Indian] rainfall, and a decrease of pressure in Australia : this is part of the main oscillation described in the previous paper* which will in future be called the 'southern' oscillation." Available at: Royal Meteorological Society互联网档案馆的存檔,存档日期18 March 2017.
Walker, G. T. Correlation in seasonal variations of weather. IX. A further study of world weather. Memoirs of the Indian Meteorological Department. 1924, 24: 275–332. From p. 283: "There is also a slight tendency two-quarters later towards an increase of pressure in S. America and of Peninsula [i.e., Indian] rainfall, and a decrease of pressure in Australia : this is part of the main oscillation described in the previous paper* which will in future be called the 'southern' oscillation." Available at: Royal Meteorological Society互联网档案馆的存檔,存档日期18 March 2017.