The legendary text book on marketing is by Philip Kotler. But if you go to flipkart you will find that books of the following publications have very good books on marketing:
1. Pearson Publications
2. Wharton School of management
3. Kellog School of management.
These books of these publications are also affordable.
I would humbly suggest that you read and if possible do a DALE CARNEGIE sales course. Not only does it highlights and enhances your sales pitch and perspective but it does wonders for your personal life as well.