We would like to recommend this inspiring book on Bilingualism,  by Adam Beck.

Adam Beck, founder of the popular blog Bilingual Monkeys and the lively forum The Bilingual Zoo, provides a roadmap to greater success and joy raising bilingual kids in this practical and comprehensive guide for parents and teachers. A longtime practitioner of bilingual development in children, Beck shares the best of his personal experience as an educator and parent, offering a wealth of actionable advice in his engaging and empowering book

You can buy it from Amazon