edited by Joanna Household
Webb & Bower, 1983
Buku Referensi
Cayley, Neville W., author
Angus and Robertson, 1931
Buku Teks
Ernalida, author
Fakultas keguruan dan ilmu pendidikan Universitas Sriwijaya Palembang, 2007
Artikel Jurnal
Monk, Keith, author
McGraw-Hill, 1989
Buku Teks
Bell, Jefrey A., author
Edinburgh University Press, 2016
Buku Teks