Herbert, Walter B.
Fitzhenry ,
Buku Teks
Herbert, Walter B.
Best Printing, 1928
Buku Teks
Yoder, Dale
Prentice-Hall, 1962
Buku Teks
Johnson, Rossall James, 1917-
[publisher not identified], [date of publication not identified]
Buku Teks
Monappa, Arun
Tata McGraw-Hill, 1985
Buku Teks