Clague, E., Kramer, L., & Palli, B. (1971). The aging worker and the union: Employment and retirement of middle-aged and older workers. Praeger.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Clague, Ewan, Leo Kramer, و Balraj Palli. The Aging Worker and the Union: Employment and Retirement of Middle-aged and Older Workers. New York: Praeger, 1971.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Clague, Ewan, et al. The Aging Worker and the Union: Employment and Retirement of Middle-aged and Older Workers. Praeger, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.