Several examples of onomatopoeia can be found in the novel, A Long Way from Chicago, by Richard Peck. An onomatopoeia is when a word sounds like what it is. For example, on page 7, in the prologue, it says, "She fetched up a sigh." The word "sigh" sounds like a sigh. It is one example of onomatopoeia.
In the chapter called, "The Phantom Brakeman," page 90,
"We heard a clopping of hooves and a jangle of harness, and here came Miz Eubanks on her buckboard, back from uptown."
Both "clopping" and "jangle" are onomatopoeia because the sound hooves make sound like clopping, and the sound of the harness sounds like a jangle.
In the chapter called, "Centennial Summer," page 123 Grandma says, "Ha." "Ha" is an onomatopoeia because it sounds like laughter.
Another example is in "Centennial Summer." On page 135 Grandma and Joey are talking about war, and whether or not Uncle Grady could have been in the Mexican War.
"Rum-tum-tum," Uncle Grady said, playing an invisible drum with imaginary drumsticks.
"Rum-rum-rum," is an onomatopoeia because it is the sound a drum would make.
These are just a few examples. For more information about A Long Way from Chicago, see here: http://www.enotes.com/topics/long-way-chicago