National Safe Transit Association. Clearwater Beach, Florida, & National Safe Transit Association. (1990). High yield packaging: Proceedings NSTA '90. National Safe Transit Association.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Safe Transit Association. Clearwater Beach, Florida, و National Safe Transit Association. High Yield Packaging: Proceedings NSTA '90. Chicago, Ill.: National Safe Transit Association, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)National Safe Transit Association. Clearwater Beach, Florida, و National Safe Transit Association. High Yield Packaging: Proceedings NSTA '90. National Safe Transit Association, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.