Kachru, Yamuna
Cultures, contexts, and world englishes
Routledge, 2008
 Buku Teks
Rivers-Smith, S.
Progress and conquest book I : the creation and the world around us
Oxford University Press, 1951
 Buku Teks
Webster's New World dictionary and thesaurus
compiled by the editors of Webster's New World Dictionaries ; Michael Agnes, editor in chief ; with principal thesaurus text by Charlton Laird
Houghton Mifflin Harcourt, 2013
 Buku Referensi
Straus, Jane
The blue book of grammar and punctuation : an easy-to-use guide with clear rules, real-world examples, and reproducible quizzes / Jane Straus
Jossey-Bass, 2008
 Buku Teks
Laird, Charlton Grant, 1901-
Webster's new world thesaurus
Simon and Schuster, 1985
 Buku Referensi