Verbit, Gilbert P.
Columbia University Press, 1969
Buku Teks
Hilling, David
Routledge, 1996
Buku Teks
King, Felicity Savage
Oxford University Press, 1995
Buku Teks
edited by Richard M. Bird and Oliver Oldman
John Hopkins, 1967
Buku Teks
East-West Center Press, 1967
Buku Teks