//-->
Information - Schlüssel zum Wissen : Methoden und Probleme der wissenschaftlich-technischen Information
Winde, Bertram, (1972)
Function and organization of a national documentation centre in a developing country
Schütz, Harald, (1985)
Methoden und Formen der Literaturinformation
Hirsch, Sigrid, (1969)
Facts and how to find them : a guide to sources of information and to the method of systematic research
Bagley, William Alfred, (1938)