The World book encyclopedia : volume 5
World Book, 1985
 Buku Referensi
International encyclopedia of psychology : volume two
edited by Frank N. Magill
Fitzroy Dearborn Publishers, 1996
 Buku Referensi
International encyclopedia of psychology : volume one
edited by Frank N. Magill
Fitzroy Dearborn Publishers, 1996
 Buku Referensi
International encyclopedia of linguistics; Volume 1
William Bright, editor-in-chief
Oxford University Press, 1992
 Buku Referensi
International encyclopedia of linguistics; Volume 2
William Bright, editor-in-chief
Oxford University Press, 1992
 Buku Referensi
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