Oh my. There are so many sources, it's really hard to narrow down my favorites. But let's see here...
I don't have many online favorites. I'll google a question and read articles and watch youtube videos. They aren't credible sources, so I wouldn't quote them in speeches, but just googling the questions can bring up tons of different views on the subjects.
But, I have several favorite published sources, and I'll only post a few.
1. Basic Theology by Charles Ryrie
-Everyone always quotes Systematic Theology by Wayne Grudem, and while it's a great source for understanding topics, it's SO overused. This one is a great resource for quotes. It's much shorter than Grudem's book, and more concise. I quote him for almost every attribute of God. It's the best.
2. The Questions Christians Hope No One Will Ask by Mark Mittelberg
-This guy's son competed in Apol. in stoa, and I'm pretty sure he competed in NCFCA. Either way, he answers several of our lquestions as if he was giving an apologetics speech through his book. It's so helpful, and really interesting. I read through it in a day because I couldn't stop reading. <3
3. Mere Christianity by C.S. Lewis
-I'll echo Emily on this one. It's an awesome book. I love it so much. But then again, I love everything he writes.
You are officially awesome for quoting Lecrae, btw. Because well, he's awesome. -seen him in concert and got to meet him- I have definitely quoted him, too. And giving his story is really impactful. I think giving C.S. Lewis' background is good for quoting him, too. Everyone knows who he is, but not everyone knows that he was a professing atheist for a while. And he's got some good quotes about his backgroud there, too.