Unschooling by definition does not follow any particular curriculum. Instead your child's interests drive their learning experiences and journey, allowing for a completely personalized approach to education.
John Holt & Pat Farenga, Teach Your Own: The John Holt Book of Homeschooling, Da Capo Lifelong Books, 2003.
Mary Griffith, The Unschooling Handbook: How to Use the Whole World as Your Child's Classroom, Three Rivers Press, 1998.
Kerry McDonald, Unschooled: Raising Curious, Well-Educated Children Outside the Conventional Classroom, Chicago Review Press, 2019.