Reference etiquatte:a guide to excruciatingly correct bahavior
 Artikel Jurnal
Lewis, Norman, author
Dictionary of correct spelling : a handy reference guide
Harper & Row , 1962
 Buku Referensi
Chamberlin, Marry W., author
Guide to art reference books.
American Library Association, 1959
 Buku Referensi
Turbo C : reference guide
Borland International, 1988
 Buku Referensi
Antenna applications reference guide
editors, Richard C. Johnson, Henry Jasik
McGraw-Hill, 1987
 Buku Referensi
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