Bibliografi : hlm. 213
Judul asli : "The secret of childhood"
Bibliografi: hlm. 180-181No Inv.: 775-780/S/Perp/87/5c~1539/Perp/87/1c~2447/S/Perp/87/1c~49/S/Perp/88/1c~475/S/Perp/88/1c~452/S/Perp/88/1c~1403-1404/S/Perp/89/2c~272/S/Perp/90/1c~735-736/S/Perp/90/2c~1024/S/Perp/91/1c~1121-1124/S/Perp/91/5c~918/S/Perp/92/1c~305/S/Perp/93/1c~535/S/Perp/93/1c~556/S/Perp/93/1c~5165-5169/P/Perp/99/5c~501-502~73578/S/00/2c~115170/PH/Perp/08/1c
No Inv.: 85184-85185/S/Perp/03/2c~89130-89132/s/Perp/04/3c
Bibliografi : hlm 123-126
No Inv.: 112105-112109/P/Perp/08/5c~122727-122731/PP/Perp/10/5c~129691/SM/Perp/11/1c~136039/SM/Perp/13/1c~143113,143112,143111/P/Perp/14/3c~143108-143113/P/Perp/14/3c
Bibliografi : hlm. 315-328
Bibliografi : hlm. 171-172