Walford's guide to reference material : fifth edition, volume 1, science and technology
Library Association, 1989
 Buku Referensi
THe New Lexicon Webster's Dictionary of the English Language Volume 1(Encyclopedic Edition)
Danbury : Lexicon Publications, Inc., 2004,
 Buku Referensi
Chaisson, Eric, author
Astronomy today : third edition
Prentice-Hall, 1999
 Buku Referensi
Vaughan, Terry A.
Mammalogy : third edition
Saunders College Publishing, 1986
 Buku Referensi
Matlin, Margareth W., author
Psychology (third edition)
Harcourt Brace College Publisher, 1999
 Buku Teks
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