Churchill, W.A., author
Watermarks in paper : in Holland, England, France etc, in the XVII and XVIII centuries and their interconnection
Menno Hertzberger & Co., 1935
 Buku Referensi
White, A. Blanco
Patents, trade marks, coptrightand industrial design / A. Blanco White and Robin Jacob
Sweet and Maxwell, 1970
 Buku Teks
Sibley, J.F., author
Online patents trade marks and service marks database
Aslib, 1991
 Buku Referensi
Intellectual property in Europe
Guy Tritton; Richard Davis ... [et al.].
Sweet & Maxwell, 2008
 Buku Teks
Ita Gambiro, author
Hukum paten
Sebelas Printing, 1996
 Buku Teks
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