Anon.: Private correspondence with Hugh Darwen (December 2005 - January 2006).
E. F. Codd: "Derivability, Redundancy, and Consistency of Relations Stored in Large Data Banks," IBM Research Report RJ599 (August 19th, 1969).
E. F. Codd: "A Relational Model of Data for Large Shared Data Banks," CACM 13, No. 6 (June 1970). Republished in Milestones of Research—Selected Papers 1958-1982 (CACM 25th Anniversary Issue), CACM 26, No. 1 (January 1983). Есть русский перевод М.Р. Когаловского: Е.Ф. Кодд. Реляционная модель данных для больших совместно используемых банков данных, СУБД, N 1, 1995,
E. F. Codd: "A Data Base Sublanguage Founded on the Relational Calculus," Proc. 1971 ACM SIGFIDET Workshop on Data Description, Access and Control, San Diego, Calif. (November 1971). (По поводу языка ALPHA можно также прочитать пересказ С.Д. Кузнецова двух статей Дейта: и .)
E. F. Codd and C. J. Date: "Much Ado About Nothing," in C. J. Date, Relational Database Writings 1991-1994 (Addison-Wesley, 1995).
Hugh Darwen (writing as Andrew Warden): "A Constant Friend," in C. J. Date, Relational Database Writings 1985-1989 (Addison-Wesley, 1990).
C. J. Date: The Database Relational Model: A Retrospective Review and Analysis. Reading, Mass.: Addison-Wesley (2000).
C. J. Date: "To Be Is to Be a Value of a Variable," www.thethirdmanifesto.com (July 2006). Имеется перевод на русский язык С.Д. Кузнецова: К. Дж. Дейт. Быть или не быть значению переменной
C. J. Date and Hugh Darwen: Databases, Types, and the Relational Model: The Third Manifesto (3rd edition). Reading, Mass.: Addison-Wesley (2006). (Второе издание книги опубликовано в переводе на русский язык: К. Дж. Дейт, Хью Дарвен. Основы будущих систем баз данных: третий манифест. Перевод под ред. С.Д.Кузнецова, Янус-К, 2004.)
Zohar Manna and Richard Waldinger: The Logical Basis for Computer Programming, Volume 2: Deductive Systems. Reading, Mass.: Addison-Wesley (1990).
Sybil P. Parker (ed.): The McGraw-Hill Dictionary of Mathematics. New York, N.Y.: McGraw-Hill (1994).
Eric W. Weisstein: CRC Concise Encyclopedia of Mathematics. Boca Raton, Fla.: Chapman & Hall / CRC (1999).
