Butler, R. W. [ca. 2007]. Saddlepoint approximations with applications. In Cambridge series in statistical and probabilistic mathematics [Book]. Cambridge: Cambridge University Press.

BUTLER, Ronald W., 2007. Saddlepoint approximations with applications. Cambridge: Cambridge University Press. Cambridge series in statistical and probabilistic mathematics, [22]. ISBN 9780521872508.

Butler, R. W. „Saddlepoint approximations with applications“. Cambridge series in statistical and probabilistic mathematics, book, Cambridge University Press, 2007.

Butler, Ronald W.: Saddlepoint approximations with applications, . Cambridge series in statistical and probabilistic mathematics, Cambridge 2007.

Butler, R.W. (2007), Saddlepoint approximations with applications, Cambridge series in statistical and probabilistic mathematics, Bd. , Cambridge University Press, Cambridge.