Ripple, G. Garry
Do-it write
Octameron, 2001
 Buku Teks
White, Roderick
Advertising : what it is and how to do it
McGraw-Hill, 1993
 Buku Teks SO
How to do a University
by Andrew M. Barclay ... [and others]
John Wiley & Sons, 1971
 Buku Teks
Allen, William Richard, 1924-
What managers do
American Management Association, 1993
 eBooks
Breen, George Edward, 1911-
Do-it-yourself marketing research
McGraw-Hill , 1982
 Buku Teks SO