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If your book is going to be published by a traditional publishing house, they'll format it however they like. If your book is going to be self-published, you can format it however you like. Go ahe...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/24243 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24243 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If your book is going to be published by a traditional publishing house, they'll format it however they like. If your book is going to be self-published, you can format it however _you_ like. Go ahead and break convention for one chapter if you need to. I promise you won't be punished for it. :)