The book I was referring to is the textbook that nostr:nprofile1qqsv05efwt3e34xjpntfkx5y2x2kes2296gxttg63ldpshpqy6vfx7cprfmhxue69uhkummnw3ezummjv9hxwetsd9kxctnyv4mqzrthwden5te0dehhxtnvdakqn2w87n is working on, it may have been released already, you can check.
Also nostr:npub17cyatz6z2dzcw6xehtcm9z4...