Perrin, R. (1971). Focus the future: An introduction to long range corporate planning. Management.
استشهاد بنمط شيكاغوPerrin, Robert. Focus the Future: An Introduction to Long Range Corporate Planning. London: Management, 1971.
MLA استشهادPerrin, Robert. Focus the Future: An Introduction to Long Range Corporate Planning. Management, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.