Brennan, J. G. (1967). The meaning of philosophy: A survey of the problems of philosophy and of the opinions of philosophers (2nd ed.). Harper & Row.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Brennan, Joseph Gerard. The Meaning of Philosophy: A Survey of the Problems of Philosophy and of the Opinions of Philosophers. 2nd ed. New York: Harper & Row, 1967.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Brennan, Joseph Gerard. The Meaning of Philosophy: A Survey of the Problems of Philosophy and of the Opinions of Philosophers. 2nd ed. Harper & Row, 1967.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.