• Authors with same surname - S. Duff (1959) and R. Duff (1989) also found
  • Two or more works by the same author(s) - Past research (Jones & Muntz, 1981, 1983)
  • Works by same authors with same pub. date - Several studies (Brockman & Pie, 1978a, 1979b)
  • Works by different authors are listed in the same parentheses in alphabetical order - Several studies (Frink & Stu, 1979; Moleman, 1978)
  • Specific part of a source - (Pennycandy, 1980, chap. 35)
  • For letters, conversations, etc. (Cite only in text.) - S. Stanky (personal communication, November 1, 2000)

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