Duffin, R. J. [ca. 1979]. Constructive approaches to mathematical models : proceedings of a conference in honor of R. J. Duffin, Pittsburgh, Pa., 10 - 14 July, 1978 (C. V. Coffman, Hrsg.) [Book]. New York: Academic Press.

DUFFIN, Richard J., 1979. Constructive approaches to mathematical models : proceedings of a conference in honor of R. J. Duffin, Pittsburgh, Pa., 10 - 14 July, 1978. [book]. 1979. New York: Academic Press. ISBN 012178150 X.

Duffin, R. J. Constructive approaches to mathematical models : proceedings of a conference in honor of R. J. Duffin, Pittsburgh, Pa., 10 - 14 July, 1978. Herausgegeben von Charles V. Coffman, book, Academic Press, 1979.

Duffin, R.J. (1979), „Constructive approaches to mathematical models : proceedings of a conference in honor of R. J. Duffin, Pittsburgh, Pa., 10 - 14 July, 1978“, herausgegeben von Coffman, C.V., Academic Press, New York.