Kocaoluk, H. Hülya Are zebras going to bed ?/ H. Hülya Kocaoluk. - İstanbul: Kocaoluk, 2000. - 16 p.; 23 cm. - Stage 1, book 6 . Pembe Mavi ISBN: 9758252585 Dewey Class. No.: 428.6 / KOC 2000