Summers, Vivian, author
Clear English
Penguin Books, 1991
 Buku Teks
Gilbert, Judy B., author
Clear speech: pronunciation and listening comprehension in North American English: teachers resource book
Cambridge University Press, 2005
 Buku Teks
Shidle, Norman G., author
Clear writing for easy reading
McGraw-Hill, 1951
 Buku Teks
Flesch, Rudolf, author
The Art of clear thinking
Harper & Row, 1951
 Buku Teks
Henny Marlyna, author
Peranan program clear to 10 dalam mempertahankan kemapanan Shampoo Clear
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2004
 UI - Skripsi (Membership)
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