Brown, L. R., flavinm, c., & kanem hal. (1996). Vital signs: The trends that are shaping our future. W.W. norton company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBrown, Lester R., christopher flavinm, और kanem hal. Vital Signs: The Trends That Are Shaping Our Future. new york: W.W. norton company, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBrown, Lester R., et al. Vital Signs: The Trends That Are Shaping Our Future. W.W. norton company, 1996.
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