Recommended resources
For Tutors, Teachers, Learners, and Parents
Reference Books on Grammar
The Essential Grammar in Use text produced by Cambridge University Press is an excellent reference text for the complexities of English grammar.
Check out this text on this link
Resource books
Bond Books are suitable for primary aged learners looking to take a structured approach to education at home. The goal for users of this text is a strong performance in the 11+ exams in the United Kingdom.
Check out Bond Books on this link
Reading comprehension
In addition to my own texts The Rather Boring Book of Comprehension Passages and The Rather Interesting Book of Comprehension Passages, another further text to explore reading comprehension with a learner is Visualisation Skills for Reading Comprehension. This text focuses on short visualisation oriented activities, something I have found of great value with young learners and those challenged by comprehension.
Check out Janine Toole's text on this link
Language Acquisition
The Study of Second Language Acquisition by Rod Ellis is an excellent reference text for the wider discipline of second language learning, providing an encyclopedic account of a variety of perspectives, including cognitive, linguistic, sociocultural, and neurolinguistic.
Check out Rod Ellis' text on this link