No Inv.: 223/AF/Perp/91/1c
No Inv.: 116943/P/Perp/09/1c~139147/P/Perp/14/1c
No Inv.: 113114/P/Perp/08/1c~117729/P/Perp/09/1c
Bibliografi : hlm. 325-359
Bibliografi : hlm. 377 - 381
Bibliografi : hlm. 252-255
Judul asli : "Positioning : the Battle for ..."