Richter, Helmut
Berlin Rutten & Loening 1962
Buku Teks
Tomaiuolo, Nicholas G., author
Information Today, 2004
Buku Teks
Zenber, Helmut
Darmstadt : und Neuwied Hermann Luchterhand, 1973
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Bradley, Phil, author
Aslib, 2000
Buku Teks
Bradley, Phil, author
Aslib, 2000
Buku Teks