How to translate "e-book" and "electronic paper book" in English respectively?

E-book: E-book is short for Ebook or popular TXT or Digital book.

Or electronic magazines.

Electronic paper book: It can also be called e-book or electronic reader.

But academically, this e-book is actually an electronic ink book.

It should be added here that electronic paper books are also called PDA(Personal Digital Assistant) abroad.

For example, what is a PDA? Like the early dopod (now HTC in China) mobile phone type, it is called PDA abroad.