Kennedy, Robert, 1974-
Cambridge University Press, 2017
Buku Teks
Healey, Alan
Australian National University, 1964
Buku Teks
Stimson, J. Frank
Martinus Nijhoff, 1964
Buku Referensi
Yavas, Mehmet S.
Blackwell Publishing, 2006
Buku Teks
Bridgeman, Loraine I
New York International Journal of American Linguistics 1961
Buku Teks