Judul asli : "The Action Centred Leader"
Judul asli : "The Management Profession"
No Inv.: 382-383/P/Perp/97/2c
Judul asli : "The Essence of Leadership"
No Inv.: 2944-2953/P/Perp/97/10c~2797/P/98/1c
No Inv.: 1396-1400/P/98/5c
No Inv.: 111016-111020/P/Perp/07/5c
No Inv.: 2796-2800/P/Perp/95/5c
No Inv.: 111024-111026/P/Perp/08/5c