Playgrounds and Recreation Association of Victoria & Smith, R. (1980). To play or not to play: That is the question : a study of the Playground and Recreation Association of Victoria. Playgrounds and Recreation Association of Victoria.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Playgrounds and Recreation Association of Victoria و Ron Smith. To Play or Not to Play: That Is the Question : A Study of the Playground and Recreation Association of Victoria. [S.l.]: Playgrounds and Recreation Association of Victoria, 1980.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Playgrounds and Recreation Association of Victoria و Ron Smith. To Play or Not to Play: That Is the Question : A Study of the Playground and Recreation Association of Victoria. Playgrounds and Recreation Association of Victoria, 1980.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.