Symposium on Our Environment Singapore & Nanyang University. Institute of Natural Sciences. (1977). Proceedings of Symposium on Our Environment, October 28-30, 1976. Institute of Natural Sciences, College of Graduate Studies, Nanyang University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Symposium on Our Environment Singapore و Nanyang University. Institute of Natural Sciences. Proceedings of Symposium on Our Environment, October 28-30, 1976. [Singapore]: Institute of Natural Sciences, College of Graduate Studies, Nanyang University, 1977.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Symposium on Our Environment Singapore و Nanyang University. Institute of Natural Sciences. Proceedings of Symposium on Our Environment, October 28-30, 1976. Institute of Natural Sciences, College of Graduate Studies, Nanyang University, 1977.