1. Stefan Banach, Theorie des Operations Lineaires, Warsaw, 1932.
2. N. Bourbaki, Espaces Vectoriels Topologiques (Actualitis Scientifiques et Industrielles, 1229), Paris, 1955.
3. Transformations on sequence spaces
4. Linear operators and their conjugates
5. A. N. Kolmogoroff and S. V. Fomin, Elements of the Theory of Functions and Functional Analysis, vol. 1: Metric and Normed Spaces (translated from the first (1954) Russian edition), Albany, N. Y., 1957.