Madhurs food is just as authentic as that of Julie Sahni or most any other Indian cookbook author.
Yamuna Devis food is Indian inspired and less authentic. But has its own appeal.
Cape Chef is very kind in his praise. Thanks!
If you have any questions on Indian cooking, I would also encourage you to participate in the Indian forum at www.eGullet.com
The Indian forum already has a wealth of information that is really very rich and very diverse. You can also come post new threads and start new discussions.
I have found Julie Sahnis books to be great. Madhur has a much more personal and charming side to her books in comparison to Sahni. It also helps that Madhur shares a great wealth of personal memories that make the food come alive. If I were to buy two books on Indian cooking today, I would buy one of each of these two wonderful women.
Monica Bhide a young Indian woman based in DC has recently published a book on Indian cooking. It is not the easiest to navigate but has simple and functional recipes.
Dakshin, a book on Southern Indian cooking is excellent for foods of Southern India. It can be found in paperback and hardcopy.
Again, if you have questions on Indian cooking, you can join me at www.eGullet.com
at the Indian forum... There are already several threads that will be helpful for most anyone cooking Indian food. And you can surely ask questions that are uniquely yours and several members that are very familiar with Indian food and I shall be happy to help you.