I'll throw out a recommendation for The Little series of books (e.g., The Little Schemer, The Seasoned Schemer, The Reasoned Schemer, The Little Typer, etc.)
The first book is all you need to grok recursion. You can just toss a copy at any student who struggles with it.
The second book ends with some really non-trivial CS stuff.
They're fantastic examples of the power of good pedagogy to explain interesting and difficult concepts normally relegated to drier texts.
I'll throw out a recommendation for The Little series of books (e.g., The Little Schemer, The Seasoned Schemer, The Reasoned Schemer, The Little Typer, etc.)
The first book is all you need to grok recursion. You can just toss a copy at any student who struggles with it.
The second book ends with some really non-trivial CS stuff.
They're fantastic examples of the power of good pedagogy to explain interesting and difficult concepts normally relegated to drier texts.