|aExtra credit / |cAndrew Clements ; illustrations by Mark Elliott.
|a1st Atheneum Books for Young Readers pbk. ed.
|aNew York : |bAtheneum Books for Young Readers, |c2011.
|a189 p. : |bill ; |c20 cm.
|aAs letters flow back and forth--between the prairies of Illinois and the mountains of Afghanistan, across cultural and religious divides--sixth-grader Abby, ten-year-old Amira, and eleven-year-old Sadeed begin to speak and listen to each other.