What books to purchase?

nicklu

    hi, CDers:

There are quite a few books/notes that can be downloaded here. May I know what books shall I purchase at the  bookstore? Thanks a lot!

rio

喜欢看书的话买个OG吧

其实建议一开始就看电子档

soaring

看电子档好累

坏眼睛

nicklu

    Thanks for the reply.

May I know what books are only available in paper format not downloadable? If they are woth the money, please let me know the titles. Thanks so much!