Blaxter, Loraine
How to research
Open University Press , 1996
 Buku Teks SO
Operation research
Juanda Napitupulu ... [et.al.]
Bagian penerbitan Institut Nasional Malang, 1998
 Buku Teks
Wicks, C.T.
Operational research
Pan Books, 1971
 Buku Teks
McNeill, Patrick
Research methods
Routledge, 1990
 Buku Teks
Images of research
Cirad, 1999
 Buku Teks