Cita APA (7a ed.)

Penna, C. V., Foskett, D. J., & Sewell, P. H. (1977). National library and information services: A handbook for planners. Butterworths.

Cita Chicago Style (17a ed.)

Penna, Carlos Víctor, Douglas John Foskett, y Philip Hooper Sewell. National Library and Information Services: A Handbook for Planners. London ; Boston ; Sydney ; Wellington ; Durban ; Toronto: Butterworths, 1977.

Cita MLA (9a ed.)

Penna, Carlos Víctor, et al. National Library and Information Services: A Handbook for Planners. Butterworths, 1977.