Merriam-Webster's desk dictionary
Merriam-Webster, 1995
Buku Referensi
Merriam-Webster's pocket dictionary
Merriam Webster, 1995
Buku Referensi
Webster's guide to business correspondence
Merriam-Webster, Inc., 1988
Buku Teks
The Merriam-Webster dictionary : international edition
Merriam-Webster, 2004
Buku Referensi
Atkinson, Toby D.
Merriam-Webster's guide to international business communications
Springfield, 1994
Buku Referensi