Lenk, John D.
Prentice-Hall, 1971
Buku Referensi
Rosenberg, Robert
Holt Rinehart and Winston, 1970
Buku Teks
Anderson, Howard
Newnes , 2003
Buku Teks
Genn, Robert C.
Parker Publishing Company, 1977
Buku Referensi
Genn, Robert C.
Parker Publishing Company, 1977
Buku Referensi