I like these books because they are suitable for adults, both native English speakers and ESOL students. Each book includes 30 topics – covering punctuation, spelling and grammar at a range of levels. Each section has initial tasks, followed by a reference section and further exercises (answers at the back!). Sentences, capital letters, full stops, adding -ed, -ing, irregular verbs, negative prefixes, colons, hyphens, homophones, confusing words, informal speech, formal English, various noun endings. etc. I got mine from Amazon. There’s also a more recent international version that looks as if it combines all three books in one volume.