In which excerpt from Holes does the author develop the character of Stanley through what he is thinking?

Stanley was sitting about ten rows back, handcuffed to his armrest. His backpack lay on the seat next to him.
He smiled. It was a family joke. Whenever anything went wrong, they always blamed Stanley's no-good-dirty-rotten-pig-stealing-great-great-grandfather.
When Stanley was younger he used to play with stuffed animals, and pretend the animals were at camp. Camp Fun and Games he called it.
Stanley looked out across the vast wasteland. The air seemed thick with heat and dirt. “Not much,” he said, then hastily added, “Mr. Sir.”

The author develops the character of Stanley through what he is thinking in the excerpt: "Stanley looked out across the vast wasteland. The air seemed thick with heat and dirt. 'Not much,' he said, then hastily added, 'Mr. Sir.'"