Sibley, J.F.
Online patents trade marks and service marks database
Aslib, 1991
 Buku Referensi
Churchill, W.A.
Watermarks in paper : in Holland, England, France etc, in the XVII and XVIII centuries and their interconnection
Menno Hertzberger & Co., 1935
 Buku Referensi
Intellectual property in Europe
Guy Tritton; Richard Davis ... [et al.].
Sweet & Maxwell, 2008
 Buku Teks
Ullberg, Eskil
Trade in ideas: performance and behavioral properties of markets in patents
[, Springer], 2012
 eBooks
Undang-undang hak cipta paten dan merek: serta peraturan pelaksanaannya
pengantar dan catatan, K. Wantjik Saleh
Ghalia Indonesia , 1994
 Buku Teks