Petra Mathers Related books Lottie's new friend Atheneum • 1999 Maria Theresa Harpercollins Childrens Books Maria Theresa Harpercollins Sophie and Lou Harpercollins Childrens Books Sophie and Lou Harpercollins • 1991 Theodor and Mr. Balbini Harpercollins Childrens Books Theodor and Mr. Balbini Harpercollins