Could you recommend some good books or good websites in order to quickly learn Mandarin?

Chinese for dummies book is good:
Amazon.com: Chinese For Dummies (For Dummies (Lifestyles Paperback)) (9780764583759): Wendy Abraham: Books (http://www.amazon.com/Chinese-For-Dummies-Lifestyles-Paperback/dp/0764583751)

Or you could try this:
Learning Chinese characters: a revolutionary new way to learn and remember the 800 most basic chinese characters [Book] (http://www.google.co.uk/products/catalog?hl=en&client=safari&rls=en&q=chinese+character+book&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&biw=1528&bih=854&um=1&ie=UTF-8&tbm=shop&cid=10637966729987742853&sa=X&ei=hpWFT-GbOYqp0QWouPC0Bw&ved=0CGQQ8wIwBA#ps-sellers)

BBC Languages Chinese:
BBC - Languages - Chinese: All you need to start learning Chinese (http://www.bbc.co.uk/languages/chinese/)

This website has lots of books for Chinese on:
Hanban Book Store (http://hanbanstore.com/bookstore/index.php?cPath=22_33)

And a little book for writing characters in is a good idea, but I couldn't find a link
Good Luck! 好运

Yeah~ I believe Chinese is necessary,I suggest you find some

Professional mandarin institutions,or you can find some private

Tutors,but the fee may high.As I know some good schools,such as

Mandarin Garden (http://www.mandaringarden.org),their school lessons reviews are frequent,and warm,there are also exceed 600 teachers for your choice,so you can get the further information by addressing the following website:

learn chinese in shanghai,learn mandarin,Mandaringarden (http://www.mandaringarden.org) and there is a good answer (http://http://www.google.com.hk/url?sa=t&rct=j&q=mandarin+school+reviews&source=web&cd=2&ved=0CFIQFjAB&url=http%3A%2F%2Fwiki.answers.com%2FQ%2FWhich_mand arin_school_reviews_is_better_in_Shanghai_and_wher e_is_it_detailed&ei=sNaQT7i3JYHZigfMqIymBA&usg=AFQjCNFTzGow2scJ6cY09NyvFTdhD8mKaw&cad=rjt)