Cita APA

Lengenfelder, H. /. M. M. (1990). World guide to special libraries: 2,1 Libraries A - L. World guide to special libraries.

Citación estilo Chicago

Lengenfelder, Helga / Mitwirkender Mitwirkender. "World Guide to Special Libraries: 2,1 Libraries A - L." World Guide to Special Libraries 1990.

Cita MLA

Lengenfelder, Helga / Mitwirkender Mitwirkender. "World Guide to Special Libraries: 2,1 Libraries A - L." World Guide to Special Libraries, 1990.