Le Breton, Preston P.
Englewood Cliffs, 1961
Buku Teks
Le Breton, Preston P.
Prentice-Hall, 1961
Buku Teks
Le Brefon, Preston P.
Holt, Rinehart and Winston, 1965
Buku Teks
Hussey, David E., author
Pergamon Press, 1976
Buku Teks
Steiner, George A. (George Albert), 1912-, author
Macmillan, 1969
Buku Teks