Based on what you have stated, it is plausible to use three small quotes with proper attribution in an endnote. These three small quotes come under copyright "fair use," which is a defense for copyright infringement. You are giving credit to the copyright owner, and the amount of copied quotes is minuscule to your total work. Yes, you can sell your work for profit while using three quotes with attribution from copyrighted content.
Disclaimer:
The response is general in nature and cannot be construed as legal advice. If you would like to have legal advice, then please consult any competent attorney privately to discuss your case and establish a proper attorney-client relationship. I only work through my website at https://affordabletrademarkattorney.com/
Answered on Dec 14th, 2019 at 5:39 PM