Bibliografi : hlm. 195-198 No Inv.: 135426/SM/Perp/13/1c
Bibliografi : hlm. 529 No Inv.: 141261/PSM/Perp/14/1c
Bibliografi : hlm. 260
No Inv.: 120564/PH/Perp/09/1c
No Inv.: 131023/SM/Perp/12/1c
Judul asli:"Short cycle selling beating your competitors in the sales race"
No Inv.: 2571/S/Perp/87/1c~77192/S/01/1c
No Inv.: 4599-4608/P/Perp/97/10c~89378/PSM/Perp/04/1c