Bookshops? Pakistan

Assalaam Alaikum!!!

I am travelling to Pakistan soon and I need to buy some Books to help me in my Degree in Information Systems, and basically I was wondering if anyone knows of any decent bookstores in Rawalpindi, Islamabad or Lahore.

Thanks!!!

I would try: Saeed Book Bank (it is huge) in Jinnah Super Market. Famous Books in Super Market is also quite good.

Vanguard
Mavra
Ferozsons

all on the Mall in Lahore...
Was there recently and most of the books were old...

Islamabad : in jinnah Mr.book

Lahore: mawra book house and feroz sons at mall

take a trip of Urdu Bazar in Karachi if you can. you'll find all sorts of books here being sold pirated for very cheap.

Jazakallah Khair!!!!!
Thanks for the info!!!!!