The effect of sound masking on speech recognition
 Artikel Jurnal
Kempen, G.
Taalgebruiker in de mens
H.D Tjeenk Willink, 1976
 Buku Teks
Sabrina
Studi kasus kontrol faktor risiko keterlambatan bicara pada anak usia 1 sampai 2 tahun = A case-control study of the risk factors of delayed speech in children aged 1 to 2 years old
Fakultas Kedokteran Universitas Indonesia, 2018
 UI - Skripsi Membership
Owens, Robert E.
ntroduction to communication disorders : a lifespan evidence-based perspective
Pearson, 2015
 Buku Teks
Bender, James F.
How to talk well / James F. Bender
McGraw-Hill Book Company, Inc., 1949
 Buku Teks