Powell, M. J. D. [ca. 1981]. Approximation theory and methods [Book]. Cambridge: Cambridge University Press.
ISO-690 (author-date, English)POWELL, Michael J. D., 1981. Approximation theory and methods. Cambridge: Cambridge University Press. ISBN 0521224721.
Modern Language Association 9th editionPowell, M. J. D. Approximation theory and methods. book, Cambridge University Press, 1981.
Mohr Siebeck - Recht (Deutsch - Österreich)Powell, Michael J. D.: Approximation theory and methods, Cambridge 1981.
Emerald - HarvardPowell, M.J.D. (1981), Approximation theory and methods, Bd. , Cambridge University Press, Cambridge.
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