Robertson, Christopher R., author
Edward Arnold, 1993
Buku Teks
Lenk, John D., author
Prentice-Hall, 1981
Buku Referensi
Byers, TJ.
McGraw-Hill, 1987
Buku Teks
Terman, Frederick E. (Frederick Emmons), author
McGraw-Hill, 1952
Buku Teks
Cooper, William D. (William David), author
Erlangga, 1994
Buku Teks