Bibl. hlm. 339-349
Isi: Jilid 1 : Fisika, Jilid 2 & 3 :biologi, Jilid 4 & 5 : Medis, Jilid 6: Geografi, Jilid 7: Sejarah, Jilid 8 : Yurisprudensi, Jilid 9 : Sosiologi
Bibl. hlm. 253-267
Bibl. hlm.241 Indeks hlm.277-280
JA: Black Holes and Baby Universes and Other Essays
Bibl. hlm.314-318