Normally, when someone on the internet says "citation needed", they're either lazy, in denial, or a troll. But I can't find anything on this on the internet, an

Normally, when someone on the internet says "citation needed", they're either lazy, in denial, or a troll. But I can't find anything on this on the internet, and the top result says that ebooks are more effective: https://scholar.google.com/scholar?hl=en&q=effectiveness+ebook https://scholar.google.com/scholar?hl=en&q=effectiveness+ebo...