Dorothy Strickland in "Teaching Phonics Today: Word Study Strategies Through the Grades," states, “The best practice is to help children identify letters and numbers in an enjoyable way as they acquire the broader concepts about print and books they will need as a foundation for literacy:
-Focus on letters that have special meaning for children, such as the letters in their own names.
-Teach the alphabet song
-Read alphabet books on a regular basis and make them available for children to look at on their own.
-Make simple picture dictionaries available.
-Help children make an individual alphabet book.
For older children struggling readers, the same general phonics principals apply for teaching older grades. Application is key. You have to model and do things that are age appropriate. When students learn bad reading habits by the 4th grade, modeling is important to reteach.
Of course, if you google ABC books, you get 9,000,000, but here are a few of my favorite.
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Many of these authors are getting smart and making them into board books as well as regular books. My 2 1/2 year old reads from both. I teach her early on how to handle and treat books. Don't be afraid to start buying paper back books for your toddlers. Read those to them and put them in a magazine holder up high and keep the board books for their "reading time" alone.
Reference: IRA-www.reading.org