Worthington, C. E., Dryden, T. J., & Chauner, D. M. (1997). Healthy aging: Inspirational letters from Americans. Rutledge Books.
芝加哥风格引文Worthington, Carolyn E., Thomas J. Dryden, 与 David M. Chauner. Healthy Aging: Inspirational Letters from Americans. Bethel, CT: Rutledge Books, 1997.
MLA引文Worthington, Carolyn E., et al. Healthy Aging: Inspirational Letters from Americans. Rutledge Books, 1997.
警告：这些引文格式不一定是100％准确.