Rugg, R. D. (1974). The use and non-use of urban parks: Accessibility and social characteristics in relation to public outdoor recreation in selected neighborhoods of Ottawa-Hull.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Rugg, Robert D. The Use and Non-use of Urban Parks: Accessibility and Social Characteristics in Relation to Public Outdoor Recreation in Selected Neighborhoods of Ottawa-Hull. 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Rugg, Robert D. The Use and Non-use of Urban Parks: Accessibility and Social Characteristics in Relation to Public Outdoor Recreation in Selected Neighborhoods of Ottawa-Hull. 1974.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.