Quote with a signal phrase
According to Jones (1998), "students often had difficulty using APA style, especially when it was their first time" (p. 199).
Quote without a signal phrase
She stated, "Students often had difficulty using APA style" (Jones, 1998, p. 199), but she did not offer an explanation as to why.
Paraphrase with a signal phrase
According to Jones (1998), APA style is a difficult citation format for first-time learners.
Paraphrase without a signal phrase
APA style is a difficult citation format for first-time learners (Jones, 1998).