What page in the catcher in the rye was loneliness

The novel, Catcher in the Rye, has the theme of loneliness and alienation running throughout the entire plotline. A good example of this is in Chapter 9, where he says: "The first thing I did when I got off at Penn Station, I went into this phone booth. I felt like giving somebody a buzz...but as soon as I was inside, I couldn't think of anybody to call up."