E.Zaleski
Organisation for Economic Cooperation and Development, 1969
Buku Teks
Springer-Verlag, 1991
Buku Teks
Yakhontoff, Victor A.
Coward-McCann, 1945
Buku Teks
Bywater, R.E.H.
Prentice-Hall, 1981
Buku Teks
Davies, W. H.
Jonathan Cape, 1933
Buku Teks