edited by John Lyons
Penguin Books, 1973
Buku Teks SO
edited by Harriet Luria, Deborah M. Seymour, Trudy Smoke
LEA, 2006
Buku Teks SO
Stankiewicz, Edward
Peter de Ridder Press , 1976
Buku Teks SO
Evans, Vyvgan
Hangukumwhasa, 2010
Buku Referensi
Croft, William
Cambridge University Press , 1990
Buku Teks SO