Bibliografi : hlm. 259-262
No Inv.: 1453-1455/BD/Perp/91/3c
No Inv.: 2432-2434/BLN/Perp/91/3c
Judul asli : "The Problems of Evolution"
No Inv.: 14590/P/Perp/94/1c
No Inv.: 1338/S/Perp/91/1c
No Inv.: 10157-10158/P/Perp/92/2c
No Inv.: 346/PN/Perp/88/1c