Cita APA (7a ed.)

Wulfen, G. v. (2011). Creating innovative products and services: The forth innovation method. Gower Pub. Ltd.

Cita Chicago Style (17a ed.)

Wulfen, Gijs van. Creating Innovative Products and Services: The Forth Innovation Method. Farnham, Surrey ; Burlington, VT: Gower Pub. Ltd, 2011.

Cita MLA (9a ed.)

Wulfen, Gijs van. Creating Innovative Products and Services: The Forth Innovation Method. Gower Pub. Ltd, 2011.