No Inv.: 103087/S/Perp/05/1c~113182-113183/S/Perp/08/2c
Bibliografi : hlm. 248-249
Bibliografi : hlm. 674-709
No Inv.: 1632-1633/BD/Perp/87/2c
No Inv.: 1925-1926/Perp/85/2c
No Inv.: 119899-119901/P/Perp/09/3c
Judul asli : "The Educational Significance of the Future"