Carr, Archie, author
Time-Life International, 1975
Buku Teks
Clark, Brian D., author
Mansell, 1980
Buku Teks
Marriot, Bety Bowers, author
McGraw-Hill, 1997
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Wood, Christopher, author
Addison-Wesley, 1998
Buku Teks
American Library Association, 1988
Buku Referensi