Catechism of the Catholic Church §911 — excerpt
In the Church, "lay members of the Christian faithful can cooperate in the exercise of this power [of governance] in accord with the norm of law."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: CIC, can. 129 # 2 · CIC, cann. 443 # 4 · 463 ## 1 · 2 · 492 # 1 · 511 · 517 # 2 · 536 · 1421 # 2