Malmberg, Bertil
Royal University of Lund, 1964
Buku Teks SO
Croft, William
Cambridge University Press, 2004
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
Greenberg, Joseph H. (Joseph Harold), 1915-2001
University of Chicago Press, 1957
Buku Teks SO