The economics of postal service / Michael A. Crew, Paul R. Kleindorfer
Privatizing telecommunications systems : business opportunities in developing countries / William W. Ambrose, Paul R. Hennemeyer, Jean-Paul Chapon
Classificação portuguesa das actividades económicas (CAE - Rev. 2)
Théorie Z : faire face au défi japonais / William Ouchi, Henri-Claude de Bettignies