Here are some other modern books on Stoicism that Amazon says are popular with people who pre-ordered my How to Think Like a Roman Emperor: The Stoic Philosophy of Marcus Aurelius.
The Little Book of Stoicism by Jonas Salzgeber
The Inner Citadel by Pierre Hadot
A Guide to the Good Life by William Irvine
The Practicing Stoic by Ward Farnsworth
The Stoic Handbook
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