Helfert. (2013). Design Science: Perspectives from Europe (1.). Springer International Publishing.
Cita Chicago (17th ed.)Helfert. Design Science: Perspectives from Europe. 1. Springer International Publishing, 2013.
Cita MLA (8th ed.)Helfert. Design Science: Perspectives from Europe. 1. Springer International Publishing, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.