Text in periodical Martin, James. – «Welcome to Bill Vorn's apocalyptic world of Bedlam». – Concordia's Thursday Report. – Vol. 26, no. 2 (Sept. 27, 2001). – P. 1, 11.
Book Martin, James. – Principles of data-base management. – Upper Saddle River : Prentice Hall, 1976. – 352 p.