Comments on the "letter to the editor"by Burrell
 Artikel Jurnal
Colin-Jones, Graham, author
The complete asian letter writer
Times Books International, 1995
 Buku Teks
Fitri Hayati, author
Studi degradasi fotokatalitik zat warna Azo scarlet red dengan katalis ZnO tersuspensi
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2007
 UI - Skripsi (Membership)
News Letter : a magazine of writing & art
Kansas City : University of Missouri
 Majalah, Jurnal, Buletin
Letter heads business cards 2
Pageone, 2010
 Buku Teks
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