Liaw, B. T. (1985). Effects of practical experience and sequential skills on achievements in map reading for secondary one pupils in Singapore.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Liaw, Beng Teck. Effects of Practical Experience and Sequential Skills on Achievements in Map Reading for Secondary One Pupils in Singapore. 1985.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Liaw, Beng Teck. Effects of Practical Experience and Sequential Skills on Achievements in Map Reading for Secondary One Pupils in Singapore. 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.