Cita APA (7a ed.)

British Library., editor, & Leydon, M. (1991). Market research: A guide to British Library holdings (7th ed.). British Library.

Cita Chicago Style (17a ed.)

British Library., editor, y Michael Leydon. Market Research: A Guide to British Library Holdings. 7th ed. London: British Library, 1991.

Cita MLA (9a ed.)

British Library., editor, y Michael Leydon. Market Research: A Guide to British Library Holdings. 7th ed. British Library, 1991.