Well, that's where things can get a bit more complicated. If there are more than three authors, you would list the first author, followed by et al., which is like a shortcut for "and the rest of the gang". For example: Smith, John, et al. It's like when you're at a party and you're introducing your friends, you don't need to introduce every single person, you can just say "and the rest of the crew".
And, just like how you would introduce your friends, you need to make sure you're introducing your authors in the correct order. In MLA style, you would list the authors in the order they appear on the title page of the book. It's like following a map, you need to follow the directions to get to your destination.
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