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 ChicagoManual of Style, 16th Edition, p 796.
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--Basic (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)