Wharton on Dynamic Competitive StrategyGeorge S. Day, Day, George S. Day, David J. ReibsteinInbunden, 1997510 kr
Wharton on Managing Emerging TechnologiesDay, Gunther, George S. Day, Paul J. H. SchoemakerHäftad, 2004295 kr
Directory of Important World Honey SourcesEthel Crane, Walker, Day, International Bee Research AssociationHäftad, 1984567 kr