One of the best books for any speech-impaired reader. This is one of the few books that had helped to resolve my speech defects. For over 30 years, I had very severe speech impediments. Over the next 10 years, most speech defects were only mild and eventually dissolved. Today, I can speak with absolute fluency and more surprisingly I can sing too. My hard-worked pronunciation is now perfect.
If you're deaf, I most recommend a pronouncing dictionary (the most ideal gift for any deaf-born child). If you have some degree of hearing, then do buy yourself a pronouncing dictionary with the CD-ROM. All the pronunciations are cryptically written in IPA alphabets, each alphabet representing a certain sound, which you make with just a certain lip position and a tongue position.
A PRONOUNCING DICTIONARY IS MOST VITAL TO ANY DEAF READER - and SHOULD be introduced in every deaf school in the country. I myself went to a deaf school where the outmoded speech therapy was dreadful and abstruse. I'd never really learned any good speech there, only the approximate sounds. Only in my twenties did I really learn the basics of correct/proper pronunciations. Firstly, I learned the pronunciation of each letter - by graphic/visual descriptions of shaping lips and tongue when making sounds. It took me years to rebuild my pronouncing vocabulary - with the help of a pronouncing dictionary.
Pronouncing dictionaries help you distinguish any confusing, sound-alike pronunciations such as "such" and "search," "caught" and "cot," "sword" and "sawed," etc. And learn to rhyme words such as "beautiful" and "dutiful," "feather" and "leather," etc.
Once you have mastered IPA alphabets and speech, you can too learn foreign languages - and you CAN. I have learned oral German and French and can speak with such absolute fluency that parents have asked me to give grinds to their kids.
Your second book should be "English Phonetics and Phonology: A Practical Course" by Peter Roach. This one teaches phonetics in details - the IPA alphabets, lip positions, tongue positions, etc.
Your third and subsequent books should contain exercises for your vocal cords, tongue, lungs, breathing techniques, etc.