You can refer to it, but you can't require students to use a certain book. The course should stand on its own. Best way to ensure no issue would be to contact the author and get permission to do the course and referring to their book. For some of my courses I contacted the certification provider and got written permission to use their logo. Good thing I did, 2 years later their legal department contacted me, telling me to remove it from all my materials. Since I had the letter from their legal department allowing it, I sent the email back to them and they said .. hmm OK then.
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