Dakin, Julian
The language laboratory and language learning
Longman, 1975
 Buku Teks SO
Sabrina Asrianty Putri
The Student motivation in learning English as a foreign language through discovery learning = Motivasi siswa dalam belajar Bahasa Inggris sebagai bahasa asing melalui pembelajaran penemuan
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2019
 UI - Tugas Akhir
Harris, David P.
Testing english as a second language
McGraw-Hill, 1969
 Buku Teks SO
Designing second language performance assessments
by John M. Norris ... [and others]
University of Hawaii Press, 1998
 Buku Teks SO
Ur, Penny
A course in language teaching : practice and theory
Cambridge University Press, 1999
 Buku Teks SO