Artikel Jurnal
McMenemy, David, author
Facet, 2009
Buku Teks
edited by Larry Nucci
Lawrence Erlbaum Associates, 2005
Buku Teks
edited by Mattias De Backer ... [and others]
NY Routledge, 2016
Buku Teks
Cunha, George Daniel Martin, author
Scarecrow Press, 1971
Buku Referensi