Baltser, Mark
Narcissus' Echo
querido's uigeverij, 1992
 Buku Teks
Japan Echo
Japan Echo Inc.,
 Majalah, Jurnal, Buletin
Dubois, Pierre Hubert, 1917-1999
Zonder echo
Heideland, 1966
 Buku Teks
Luthra, Atul
Echo made easy
Jaypee Brothers Medical Publishers, 2012
 Buku Teks
Arfan
Simulasi echo canceller dengan basis NLMS
Fakultas Teknik Universitas Indonesia, 1999
 UI - Skripsi (Membership)