Grayson, Leslie E.
John Wiley & Sons, 1981
Buku Teks
Calman, Leslie J.
Westview Press, 1985
Buku Teks
Greener, Leslie
The Viking Press , 1962
Buku Teks
Dickinson, Leslie
Cambridge University Press , 1988
Buku Teks
Palmier, Leslie H.
The Athlone Press, 1969
Buku Teks