Lam, S. Y. (1994). Spatial ability, formal reasoning ability, and field dependence-independence as predictors of form IV students' achievements in geometry and engineering drawing.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Lam, Saw Yin. Spatial Ability, Formal Reasoning Ability, and Field Dependence-independence as Predictors of Form IV Students' Achievements in Geometry and Engineering Drawing. 1994.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Lam, Saw Yin. Spatial Ability, Formal Reasoning Ability, and Field Dependence-independence as Predictors of Form IV Students' Achievements in Geometry and Engineering Drawing. 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.