Derwent Information (Firm). (2002). Derwent global patent sources: An overview of international patents (4th ed.). Thomson Derwent.
Chicago Style (17th ed.) CitationDerwent Information (Firm). Derwent Global Patent Sources: An Overview of International Patents. 4th ed. London: Thomson Derwent, 2002.
MLA (8th ed.) CitationDerwent Information (Firm). Derwent Global Patent Sources: An Overview of International Patents. 4th ed. Thomson Derwent, 2002.
Warning: These citations may not always be 100% accurate.