Girard, Denis
Cassell , 1981
Buku Referensi
edited by John L. Bradley and Martin Stevens
Rinehart and Winston, 1968
Buku Teks
English Universities Press, 1955
Buku Referensi
Harrap Book Limited, 1991
Buku Referensi
consultant editor, D.E. Hathway
Harrap, 1985
Buku Referensi