Flipkart.com: Handbook Of Means And Their Inequalities: P. S. Bullen, Dragoslav S. Mitrinovic, M. Vasic: Books Buy Mitrinovic Vasic Mean in India
Amazon.com: Handbook of Means and Their Inequalities (Mathematics and Its Applications) (9781402015229): P.S. Bullen: Books
Powell's Books - Handbook of Means and Their Inequalities by P. S. Bullen
Flipkart and Amazon report having it in stock, Powells doesn't say anything however. Guess you'll have to enquire.
If these links aren't what you're looking for, try this:
Probably the best place to find it