Enis, Ben M., author
Goodyear, 1974
Buku Teks
Francis, Philip H., author
AMACOM, 1977
Buku Teks
Martin, James, author
Prentice-Hall, 1976
Buku Teks
Alford, Leon Pratt, author
Ronald Press, 1951
Buku Teks
Alford, Leon Pratt, author
Ronald Press, 1940
Buku Teks