APA Style
Keys, Paul. (1993).
Operational Research and Systems : The Systemic Nature of Operational Research .
:
.
Chicago Style
Keys, Paul.
Operational Research and Systems : The Systemic Nature of Operational Research.
:
,
1993.
.
MLA Style
Keys, Paul.
Operational Research and Systems : The Systemic Nature of Operational Research.
:
,
1993.
.
Turabian Style
Keys, Paul.
Operational Research and Systems : The Systemic Nature of Operational Research.
:
,
1993.
.