Symposium on Population Pressures upon Physical and Social Resources in the Developing Lands, Pennsylvania State University, Kosinski, L. A., Prothero, R. M., & Zelinsky, W. (1970). Geography and a crowding world: A Symposium on population pressures upon physical and social resources in the developing lands. Oxford University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Symposium on Population Pressures upon Physical and Social Resources in the Developing Lands, Pennsylvania State University, Leszek A. Kosinski, R. Mansell Prothero, و Wilbur Zelinsky. Geography and a Crowding World: A Symposium on Population Pressures upon Physical and Social Resources in the Developing Lands. New York ; London: Oxford University Press, 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Symposium on Population Pressures upon Physical and Social Resources in the Developing Lands, Pennsylvania State University, et al. Geography and a Crowding World: A Symposium on Population Pressures upon Physical and Social Resources in the Developing Lands. Oxford University Press, 1970.