Campbell, George L.
Routledge, 1995
Buku Referensi
Katzner, Kenneth
Routledge, 1995
Buku Referensi
edited by Bernard Comrie
Oxford University Press, 1987
Buku Teks
edited by Bernard Comrie
Routledge, 1991
Buku Referensi
edited by William N. Locke and A. Donald Booth
MIT Press, 1965
Buku Teks