Respuesta :

when you introduce the quote with the author instead of putting it at the end. For example
Smith (2000) noted that “monkeys are cute” while Jay (2002) argues they “are fluffy”.
Vs
It is argued that “monkeys are cute” (Smith, 2000) and are also “fluffy” (Jay 2002).

Citation is unnecessary for familiar proverbs, well-known quotations, and common knowledge.