Keys, P. (1991). Operational Research and Systems: The Systemic Nature of Operational Research (1st ed. 1991.). Springer US. https://doi.org/10.1007/978-1-4899-0667-0
Chicago-Zitierstil (17. Ausg.)Keys, Paul. Operational Research and Systems: The Systemic Nature of Operational Research. 1st ed. 1991. New York, NY: Springer US, 1991. https://doi.org/10.1007/978-1-4899-0667-0.
MLA-Zitierstil (9. Ausg.)Keys, Paul. Operational Research and Systems: The Systemic Nature of Operational Research. 1st ed. 1991. Springer US, 1991. https://doi.org/10.1007/978-1-4899-0667-0.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.