What Bookstores are there in Bangkok, Thailand?

My Parents are going to Bangkok, and I want them to look for a book for me... I wanna be sure and give them a list of Bookstores in Bangkok. Hopefully, if you know any, I am asking for Bookstores found in the Bangkok's popular malls. Thank You!

The biggest bookstores are B2S and Kinokuniya, you'll find one or both of these stores in places like Central World Plaza, Siam Paragon and the Emporium Mall and other malls as well. Asiabooks and Bookazine stores can also be found in some malls, but aren't as large as the first two. B2S and Kinokuniya both have huge stores in many locations, especially B2S.

Every mall in Bangkok has a bookstore, however these usually have only Thai books. English book stores are plenty as well, especially in the malls near to the areas where foreigners stay usually. I mostly buy in Asiabooks - http://www.asiabooks.com

Two fine bookstores additional to these chains in the malls are Chula Books within Siam Square, which has lots of English books upstairs; also within the National Museum (not far from Grand Palace) River Books operates the gift shop and also has many English books on Thai topics, mostly history and arts of course.

Kinokuniya bookstore
-Kinokuniya @ the Emporium
(Prompong BTS station)

-Kinokuniya @Siam Paragon
(Siam BTS station)
-Kinokuniya@Central world plaza
(ChitLom BTS station)
if u get off at siam square, take the skywalk to central world plaza)

or Asia Book
@ Siam Paragon
@ Siam Discovery Center
(Siam BTS station)