Friend, J., & Hickling, A. (1987). Planning under pressure: The strategic choice approach. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Friend, John, agus Allen Hickling. Planning Under Pressure: The Strategic Choice Approach. [Oxford Oxfordshire] ; New York: Pergamon Press, 1987.
Lua MLA (9ú heag.)Friend, John, agus Allen Hickling. Planning Under Pressure: The Strategic Choice Approach. Pergamon Press, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.