Abraham Robinson. Forcing in model theory. Symposia mathematica, vol. 5, Istituto Nazionale di Alta Matematica, Academic Press, London and New York 1971, pp. 69–82. - Jon Barwise and Abraham Robinson. Completing theories by forcing. Annals of mathematical logic, vol. 2 no. 2 (1970), pp. 119–142. - Abraham Robinson. Infinite forcing in model theory. Proceedings of the Second Scandinavian Logic Symposium, edited by J. E. Fenstad, Studies in logic and the foundations of mathematics, vol. 63, North-Holland Publishing Company, Amsterdam and London 1971, pp. 317–340. - Abraham Robinson. Forcing in model theory. Actes du Congrès International des Mathematiciens 1970, Gauthier-Villars, Paris 1971, Vol. 1, pp. 245–250.