Παραπομπή APA

Mercer, G. L. (1964). Punched card systems: Mechanised/2e (2nd ed.). Macdonald and Evans Ltd.

Παραπομπή Chicago Style

Mercer, G. Lawrence. Punched Card Systems: Mechanised/2e. 2nd ed. London: Macdonald and Evans Ltd, 1964.

Παραπομπή MLA

Mercer, G. Lawrence. Punched Card Systems: Mechanised/2e. 2nd ed. Macdonald and Evans Ltd, 1964.