Gappert, G., & Knight, R. V. (1982). Cities in the 21st century. Sage Publications.
استشهاد بنمط شيكاغوGappert, Gary, و Richard V. Knight. Cities in the 21st Century. Beverly Hills: Sage Publications, 1982.
MLA استشهادGappert, Gary, و Richard V. Knight. Cities in the 21st Century. Sage Publications, 1982.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.