op. cit. (obra citada)
1. An abbreviation of the Latin phrase 'opere citato' meaning 'in the work cited.' Used in academic writing and footnotes to refer to a source that was cited previously without repeating the full citation.
As mentioned in Smith's earlier work (op. cit., p. 45), this theory has been debated for decades.
Como mencionado na obra anterior de Smith (op. cit., p. 45), essa teoria tem sido debatida há décadas.
2. A scholarly convention used to avoid repetition of bibliographic information when the same source is referenced multiple times in close proximity in a text.
The study demonstrated significant results (op. cit.).
O estudo demonstrou resultados significativos (op. cit.).
This Latin abbreviation is a cornerstone of traditional academic citation practices in both English and Portuguese scholarship. While still widely recognized and used in formal academic writing, many modern style guides (APA, Chicago, Harvard) have moved away from op. cit. in favor of clearer citations. It remains standard in philosophy, classics, and legal scholarship. Portuguese academia maintains its use similarly to English-language traditions, and the phrase 'obra citada' or 'op. cit.' are used interchangeably in Brazilian and Portuguese academic contexts.
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