Ontario. Dept. of Economics and Development Regional development ; selected background & Gertler, L. O. (1965). Regional development ; selected background papers for the Province of Ontario's International Conference on Regional Development and Economic Change, Feb. 15, 16, 17, Toronto, 1964. s.n.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ontario. Dept. of Economics and Development Regional development ; selected background و Leonard O. Gertler. Regional Development ; Selected Background Papers for the Province of Ontario's International Conference on Regional Development and Economic Change, Feb. 15, 16, 17, Toronto, 1964. [Toronto: s.n, 1965.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ontario. Dept. of Economics and Development Regional development ; selected background و Leonard O. Gertler. Regional Development ; Selected Background Papers for the Province of Ontario's International Conference on Regional Development and Economic Change, Feb. 15, 16, 17, Toronto, 1964. s.n, 1965.