Cita APA

Batty, D. (1992). Introduction to the twentieth edition of the Dewey decimal classification. London.

Chicago Edition Citation

Batty, David. Introduction to the Twentieth Edition of the Dewey Decimal Classification. Library Associaation: London, 1992.

Cita MLA

Batty, David. Introduction to the Twentieth Edition of the Dewey Decimal Classification. London, 1992.