Kocaoluk, H. Hülya What's in the hat?/ H. Hülya Kocaoluk. - İstanbul: Kocaoluk, 2000. - 16 p.: ill.; 20 cm. - English reading series . Pembe Mavi ISBN: 9758252593 Dewey Class. No.: 428.6 / KOC 2000