Foster, Thomas C., author
Harper, 2003
Buku Teks
Felski, Rita, author
BlackWell Publishing, 2008
Buku Teks
Mortimer J. Adler, editor in chief
Encyclopedia Britanica, 1994
Buku Referensi
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UI - Skripsi Membership
edited by Sharon Deeds, Catherine Chastain
[American Library association, ], 2001
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