Judul asli : "Perspective on Human Communication"
No Inv.: 545/S/Perp/89/1c
Judul asli : "Element of Philosophy"
Judul asli : "Bekropte Geschiedenis der wijsbegerte"
No Inv.: 1320/S/Perp/91/1c~874/S/Perp/90/1c~623/S/Perp/90/1c~540/S/Perp/89/1c~1865/S/Perp/91/1c~550/S/Perp/91/1c~77950-77952/S/01/2c
No Inv.: 85-86/S/Perp/97/2c
No Inv.: 167/S/99/1c
Judul asli : "De Wijsbegeerte van de 20e Eeuw"