Lambert, Clark
Field selling skills / Clark Lambert
John Wiley & Sons, 1981
 Buku Teks
Mackechnie, Claire
Akuisisi perusahaan= Buying and Selling a Business
Prestasi Pustaka, 2006
 Buku Teks
Stettner, Morey
Skills for new managers
McGraw-Hill, 2000
 Buku Teks
Ellis, Carol W.
Management skills for new managers
[American Management Association, ], 2005
 eBooks
Davis, Eric
Training as a business partner: business skills
[American Society for Training & Development Press, American Society for Training & Development Press], 2003
 eBooks