You are not allowed in jurisprudence to follow narrations, but the verdicts of the Marji' of Taqleed. Narrations can be authentic or not authentic. The Marji' of Taqleed assesses that. Even if the narration is authentic, you can not take its meanings superficially or through the translators, but you must follow the Marji' of Taqleed.
Some books contain narrations from different sources and you can not decide its authenticity before referring to the Marji' of Taqleed.