Collier's encyclopedia : volume 6
Macmillan Educational Company, 1990
 Buku Referensi
Encyclopedia of knowledge : volume 6
Grolier Incorporated, 1991
 Buku Referensi
The Encyclopedia Americana : volume 6
Grolier, 1994
 Buku Referensi
Lagowski, Joseph J., editor-in-chief
Macmillan encyclopedia of chemistry : volume 1
MacMillan Reference USA, 1997
 Buku Referensi
Lagowski, Joseph J., editor-in-chief
Macmillan encyclopedia of chemistry : volume 2
MacMillan Reference USA, 1997
 Buku Referensi
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