Leonard R. Bachman
Chichester, 2003
Buku Teks
Borden, Gail Peter, author
Routledge, 2014
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Lucas, Ray, author
Routledge, 2019
Buku Teks
Yaneva, Albena, author
Asghate, 2012
Buku Teks
Fiditya Daisy Charisma Aulia, author
Fakultas Teknik Universitas Indonesia, 2023
UI - Tesis (Membership)