Brown, L. R., flavinm, c., & kanem hal. (1996). Vital signs: The trends that are shaping our future. W.W. norton company.
Lua i Stíl Chicago (17ú heag.)Brown, Lester R., christopher flavinm, agus kanem hal. Vital Signs: The Trends That Are Shaping Our Future. new york: W.W. norton company, 1996.
Lua MLA (9ú heag.)Brown, Lester R., et al. Vital Signs: The Trends That Are Shaping Our Future. W.W. norton company, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.