The Encyclopedia Americana : volume 4
Americana Corporation, 1964
 Buku Referensi
Encyclopedia of microbiology; Volume 4
Lederberg, Joshua, editor-in-chief
Academic Press, 1992
 Buku Referensi
Collier's encyclopedia : volume 4
Macmillan Educational Company, 1990
 Buku Referensi
Encyclopedia of knowledge : volume 4
Grolier Incorporated, 1991
 Buku Referensi
The Encyclopedia Americana : volume 4
Grolier, 1994
 Buku Referensi
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