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Spans of time should be written as 2000–04 or 1998–2001.
The author–date system
With this system, a source is cited in the text by giving, in parentheses, the authority's name, year of publication and the page number where the original material appeared. Note there is no comma between the author's name and the date, and concluding punctuation is placed after the citation.
- Sourcing quotes is an important part of the writing process (Baker 1983, p. 12).