Colombo Plan Bureau. Development perspectives: Country issues, papers submitted by member governments to the first- Consultative Committee Meeting. Colombo Plan Bureau.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Colombo Plan Bureau. Development Perspectives: Country Issues, Papers Submitted by Member Governments to the First- Consultative Committee Meeting. Colombo, Sri Lanka: Colombo Plan Bureau.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Colombo Plan Bureau. Development Perspectives: Country Issues, Papers Submitted by Member Governments to the First- Consultative Committee Meeting. Colombo Plan Bureau.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.