(2011). Creating innovative products and services the FORTH innovation method / Gijs van Wulfen. [electronic resource].
Chicagoスタイル(17版)引用形式Creating Innovative Products and Services the FORTH Innovation Method / Gijs Van Wulfen. [electronic Resource]. 2011.
MLA(9版)引用形式Creating Innovative Products and Services the FORTH Innovation Method / Gijs Van Wulfen. [electronic Resource]. 2011.
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