RADJOU, Navi - PRABHU, Jaideep. Frugal Innovation : How to Do Better with Less. London : The Economist : Profile Books, 2015. e-book [280 s.]. Available on Internet: <https://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=1369254&lang=sk&site=ehost-live> ISBN 9781782831204.