Weiss, Alan, author
John Wiley & Sons, 2009
Buku Referensi
Smith, George Albert, author
Richard D. Irwin, 1960
Buku Teks
edited by Janice McLean
Gale Research, 1991
Buku Referensi
Sharplin, Arthur, author
McGraw-Hill, 1985
Buku Teks
Silberman, Mel, author
McGraw-Hill, 2001
Buku Teks