Cookbooks (Don't need to be healthy)

This is the only cookbook you need.

The classic Japanese cookbook is "Japanese Cooking, A Simple Art" by Shizuo Tsuji.
For Italian I like Marcella Hazan, though she is from Emilia Romagna rather than Sicily.

For Russian I have this http://www.amazon.com/Taste-Russia-Cookbook-Russian-Hospitality/dp/1880100428/ref=pd_sim_b_3

She has good recipes on her website http://www.olgasflavorfactory.com/

Not all are Russian though

I've been trying to learn Indian cooking. I have been using:
Madhur Jaffrey, Indian Cooking - it has beautiful pictures and interesting explanations of the traditional cooking
Suneeta Vaswani, Complete Book of Indian Cooking - has many more recipes covering all regions of India along with an excellent introduction about regional differences. Helpful tips and descriptions throughout.

Having used both, if I were only going to buy one I'd get the Suneeta Vaswani one because there's a lot more recipes in it. If you like pretty pictures go for the Jaffrey book. All the recipes I've tried from both books have been delicious. I've been having fun, but my spice shelf is starting to get very crowded with all the new additions. If you are going to experiment with Indian food it's helpful to have a good Indian market nearby because there are a lot of ingredients you will not ordinarily have on hand.

For Indian any of the Madhur Jaffrey cookbooks are excellent BTW
the one I learned Indian cooking from is

http://www.amazon.ca/Invitation-Indian-Cooking-Madhur-Jaffrey/dp/0375712119/ref=sr_1_7?s=books&ie=UTF8&qid=1395669102&sr=1-7

she has loads more now though (I wore my first copy of this out)

For English....I like any of the Two Fat Ladies cookbooks or Nigella Lawson's cookbooks

For Indian ....anything by Madhur Jaffrey