Encyclopedia of microbiology; Volume 1
Joshua Lederberg, editor-in-chief
Academic Press, 1992
 Buku Referensi
Encyclopedia of psychotherapy; Volume 1
editors-in-chief, Michel Hersen, William Sledge
Academic Press, 2002
 Buku Referensi
Encyclopaedia Britannica : volume 1
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
Encyclopaedia Britannica : volume 1
Encyclopaedia Britannica Inc., 1968
 Buku Referensi
Collier's encyclopedia : volume 1
Macmillan Educational Company, 1990
 Buku Referensi
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