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^Oort, J.H., 1938,Bulletin of the Astronomical Institutes of the Netherlands,8, 233.NASA ADS
^Oort, J.H., 1950,Bulletin of the Astronomical Institutes of the Netherlands,11, 91.NASA ADS
^Oort, J.H., Paris Symposium on Radio Astronomy, IAU Symposium no. 9 and URSI Symposium no. 1, held 30 July - 6 August, 1958, Edited by R.N. Bracewell. Stanford University Press, Stanford, CA, 1959., 409.NASA ADS
^Rougoor, G.W. & Oort, J.H., Paris Symposium on Radio Astronomy, IAU Symposium no. 9 and URSI Symposium no. 1, held 30 July - 6 August, 1958, Edited. by R.N. Bracewell. Stanford University Press, Stanford, CA, 1959., 416.NASA ADS
