Horn Book, giving it its highest rating of outstanding, said the book was "a rousing adventure story".

In a showcase is a rare silver filigree Horn Book.

Mahony was also responsible for the creation of the Horn Book, Inc. publishing company.

The Horn Book maintains a complete list of Winners and Honor Books online.

A review from the Horn Book called it, "A pleasure for parent and child."

Her association with Horn Book began years before.

The Horn Book also reviewed the book, praising the book's aliens as "well developed".

Horn Book called it "A poignant and distinguished story".

The Gammage Cup was one of Horn Book's best books of 1959.

The Horn Book was subsequently adopted by the federal government to help with book selection for elementary schools.