Labovitz, Sanford, author
Erlangga, 1982
Buku Teks
Suharsimi Arikunto, author
Rineka Cipta, 1993
Buku Teks
Hillier, Frederick S., author
Erlangga, 1990
Buku Teks
Kartini Kartono, author
Alumni, 1986
Buku Teks
Bogdan, Robert, author
John Wiley & Sons, 1973
Buku Teks