NONIS, K. P.; PARKER, H. E.; LARKIN, D. The Development of Hopping: An observation Checklist for Educators: 單足跳的進展程度: 教育者的觀察清單. Asian Journal of Physical Education & Recreation, [S. l.], v. 10, n. 1, p. 8–18, 2004. DOI: 10.24112/ajper.101291. Disponível em: https://ejournals.lib.hkbu.edu.hk/index.php/ajper/article/view/1291. Acesso em: 22 feb. 2024.