خدمة (اقتصاد): الفرق بين النسختين

* Steve Downton, Hilbrand Rustema, Jan van Veen, '' Service Economics - Profitable Growth with a Brand Driven Service Strategy''- s. http://www.amazon.com/Service-Economics-Profitable-service-strategy/dp/9963983804/ref=sr_1_1?ie=UTF8&qid=1310661349&sr=8-1

* [http://www.entrepreneurshipsecret.com/5-major-characteristics-of-services/ “5 Major Characteristics of Services”]

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