Wehr, Mentzer Russell
Addison-Wesley, 1985
Buku Teks
Bartholomew, Paul C., author
W.M.C. Brown, 1951
Buku Teks
Nauze, J. A. La
Melbourne University Press, 1974
Buku Teks
Brant, Irving
Charter Books, 1963
Buku Teks
Norwegian Academic Press, 1951
Buku Teks