Should I use present or past tense when introducing quotations or paraphrases in my text?
As per the American Psychological Association (2010), "use the past tense to express an action or a condition that occurred at a specific, definite time in the past, as when discussing another researcher's work and when reporting your results" (p. 78). For example, "Sanchez (2000) presented similar results" (correct) versus "Sanchez (2000) presents similar results" (incorrect) (p. 78).
For more information regarding the recommended verb tenses for different sections of a research essay, please see "Verb tense and APA Style" and/or the last paragraph on page 65 and the first paragraph on page 66 in the APA Style manual.
American Psychological Association. (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author.