No Inv.: 62857/Perp/99/5c
No Inv.: 1579/Perp/76/1c
No Inv.: 1458-1467/Perp/89/10c
No Inv.: 1955/AF/Perp/91/1c
Judul asli : "The Educational Significance of the Future"
No Inv.: 5034-5038/P/99/5c
Bibliografi : hlm. 341-347No Inv.: 144553/SM/Perp/14/1c
No Inv.: 917-923/S/Perp/98/7c
Bibliografi : hlm. 340-377No Inv.: 138817,138818/P/Perp/14/2c