FID Publication 520; Moscow: Published for the International Federation for Documentation by the All-Union Institute for Scientific and Technical Information (Viniti), 1975, 390pp* Rayward, W. Boyd.
* Rayward, Warden Boyd, https://www.ideals.uiuc.edu/handle/2142/651 "The Universe of Information: the Work of Paul Otlet for Documentation and international Organization"], FID Publication 520, Moscow, International Federation for Documentation by the All-Union Institute for Scientific and Technical Information (Viniti), 1975.