21
Mano, M. Morris
Prentice Hall,
1993,
Naver
22
Bovee, Courtland L.
Prentice Hall,
2000,
Naver
23
Stalling, William
Prentice Hall,
2003,
Naver
24
Brooke, Sandy
Prentice Hall,
2002,
Naver
25
Hollen, Norma R.
Prentice Hall,
1999,
Naver
26
Joseph-Armstrong, Helen
Prentice Hall,
2002,
Naver
27
Jaffe, Hilde
Prentice Hall,
1999,
Naver
28
Coffman, Ken
Prentice Hall,
2000,
Naver
29
Kroenke, David M.
Prentice Hall,
2001,
Naver
30
Newman, Robert C.
Prentice Hall,
2002,
Naver