Here's one for overall rapport building

Since I live in an area where people tend to have a high level of social stratification, people who aren't originally from here (like me) need to have a good ability at building rapport.

The book is called "How to Make People Like You in 90 Seconds or Less". I'm not gonna give away all the details but he basically states a few of the following and how to use them to your advantage:

- People can make a visual impression of you in just 2 seconds.
- The average attention span of a person is 30 seconds.
- It sometimes takes less than 90 seconds to make an impression of someone.

Needles to say this is not a PUA specific book. HOWEVER, BUILDING RAPPORT/Comfort IS EXTREMELY IMPORTANT. So I felt that this book should be included as a Self Improvement Book.