Social progress thought community development
United Nations Bureau of Social Affairs , 1955
 Buku Teks
Social theorists / edited by Clement S. Mihanovich
The Bruce , 1953
 Buku Teks
Survey of social science volume 5
editor, Frank N. Magill
Salem Press, 1994
 Buku Referensi
Survey of social science volume 3
editor, Frank N. Magill
Salem Press, 1994
 Buku Referensi
Survey of social science volume 4
editor, Frank N. Magill
Salem Press; , 1994
 Buku Referensi
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