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Chicago Manual of Style

Parenthetical Text Citation (author-date style)

      An author-date citation in running text or at the end of a block quotation consists of
the last (family) name of the author, followed by the year of publication of the work  in 
question. In this context, "author" may refer not only to one or more authors or an institution but 
also to one or more editors, translators, or compilers. No punctuation appears between author 
and date. 
--The Chicago Manual of Style, 16th Edition,  p 796. 

For more examples, click on tabs for books, articles and newspapers for author-date system.

(Pacini 1997)
      --Two or three authors
(Ikenbery, Rankine, and Stice 1996)
      --More than three authors
(Zipursky et al. 1997)
      --When two or more works by different authors with the same last name appear
          in the bibliography
          (C. Doershuk 2000)
          (J. Doershuk 2001)