Originally published in hardcover in the United States under the title Ollie & Moon by Random House Children's Books, New York, in 2011. Originally published in hardcover in the United States by Random House, New York, in 2010. "Originally published in hardcover in slightly different form by Alfred A. Knopf, an imprint of Random House Children's Books, New York, in 2012." Originally published in hardcover in the United States by Random House Children's Books, a division of Penguin Random House LLC, New York, in 2018. Originally published in slightly different form by Alfred A. Knopf, an imprint of Random House Children's Books, New York, in 1996. Originally published in paperback by Random House Children's Books, New York, in 1974 "Originally published in a different form in the United States by Crown Books for Young Readers, an imprint of Random House Children's Books, a division of Penguin Random House LLC, New York, in 2018." Originally published in hardcover: New York : Random House Children's Books, 2010 Originally published in hardcover by Random House Children's Books in 2007 Originally published in the United States of America by Harry N. Abrams, Inc., New York, 2001