Cita APA (7a ed.)

Derwent Information (Firm). (2002). Derwent global patent sources: An overview of international patents (4th ed.). Thomson Derwent.

Cita Chicago Style (17a ed.)

Derwent Information (Firm). Derwent Global Patent Sources: An Overview of International Patents. 4th ed. London: Thomson Derwent, 2002.

Cita MLA (8a ed.)

Derwent Information (Firm). Derwent Global Patent Sources: An Overview of International Patents. 4th ed. Thomson Derwent, 2002.