Haslund, Henning
Kegan Paul, 1934
Buku Teks
Phillips, G.D.R.
Frederick Muller, 1942
Buku Teks
Friters, Gerard M., author
The Johns Hopkins Press, 1949
Buku Teks
Cammann, Schuyler
The Ronald Pres Company, 1951
Buku Teks
Bell, H. T. Montague, author
George Routledge & Sons, 1919
Buku Teks