Heffner, R.M.S.
University of Wisconsin Press, 1960
Buku Teks SO
Romadhani
Aldine, 1968
Buku Teks SO
Mol, Hendrik, 1919-1981
Mouton, 1963
Buku Teks SO
Mol, Hendrik, 1919-1981
Mouton, 1970
Buku Teks SO
edited by Bertil Malmberg
North-Holland, 1968
Buku Teks SO