Nyhoff, Larry, author
Prentice-Hall, 1997
Buku Teks
Golde, Hellmut, author
Macmillan, 1966
Buku Teks
Etter, Delores Maria, 1947-, author
Benjamin/Cummings, 1987
Buku Teks
Nolan, Richard L., author
Addison-Wesley, 1971
Buku Teks
Ralston, Anthony, author
McGraw-Hill, 1971
Buku Teks