Richards, R. Malcolm, author
Scott, Foresman, 1984
Buku Teks
Unger, Maurice A., author
Allyn and Bacon, 1969
Buku Teks
Rosefsky, Robert S., author
John Wiley & Sons, 1978
Buku Teks
Bradley, Joseph F., author
Holt, Rinehart & Winston, 1957
Buku Teks
Hallman, G. Victor, author
McGraw-Hill, 1987
Buku Teks