Παραπομπή APA

Gray, P. M. D. (1984). Logic, algebra and databases. Ellis Horwood.

Παραπομπή Chicago Style

Gray, Peter M D. Logic, Algebra and Databases. Chichester: Ellis Horwood, 1984.

Παραπομπή MLA

Gray, Peter M D. Logic, Algebra and Databases. Ellis Horwood, 1984.