Denia Oktaviani
Types of corrective feedback in listening and speaking classroom = Tipe koreksi langsung pada kelas verbal
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2017
 UI - Makalah dan Kertas Kerja
Dowling, Barbara Tolley
Business concepts for English practice
Newbury House Publishers , 1982
 Buku Teks SO
Voiles, Price R.
Business English essentials
Glencoe, 1993
 Buku Teks SO
Dona Kumala Shinta
Penerapan umpan balik korektif melalui rekaman terhadap pemelajar bahasa Inggris di kelas listening and speaking: Studi kasus = The implementation of implicit corrective feedback through recordings towards efl students in listening and speaking English class: Case study.
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2021
 UI - Tesis Membership
James, C.V.
Business studies
Prentice-Hall, 1992
 Buku Teks SO