Sheppard, P.A. (1959). "Obituary of Sir Gilbert Walker, CSI, FRS". Quarterly Journal of the Royal Meteorological Society. 85 (364): 186. doi:10.1002/qj.49708536423.
Walker, G.T. (1927). "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. 53: 321–323. doi:10.1002/qj.49705322311.
Walker, G. T. (1924). "Correlation in seasonal variations of weather. IX. A further study of world weather". Memoirs of the Indian Meteorological Department. 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 SocietyArchived 18 March 2017 at the Wayback Machine
Walker, G. T. (1924). "Correlation in seasonal variations of weather. IX. A further study of world weather". Memoirs of the Indian Meteorological Department. 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 SocietyArchived 18 March 2017 at the Wayback Machine