Orr, J. M. (1977). Libraries as communication systems. Greenwood Press.
Citazione stile Chigago Style (17a edizione)Orr, James McConnell. Libraries as Communication Systems. Westport, Conn.: Greenwood Press, 1977.
Citatione MLA (8a ed.)Orr, James McConnell. Libraries as Communication Systems. Greenwood Press, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.