Spidchenko, K.
Progress , 1972
Buku Teks
Knox, Paul, author
Edward Arnold , 1994
Buku Teks
Pounds, Norman J. G., author
Silver Burdett, 1980
Buku Teks
Thatcher, W.S., author
English University Press, 1957
Buku Teks
Wheeler, James O., author
John Wiley & Sons, 1986
Buku Teks