Frost, Raymond, 1960-, author
The Backward society / Raymond Frost
Martin Press, 1961
 Buku Teks
Greaves, I. C. (Ida Cecil), 1907-, author
Modern production among backward peoples
George Allen & Unwih , 1935
 Buku Teks
Mandelbaun, K.
The Industrialisation of backward areas / K. Mandelbaun
Kelly Millman, Inc. , 1955
 Buku Teks
Bellamy, Edward
Looking Backward / penulis, Erdward Bellamy
The New American Library , 1960
 Buku Teks
Cheng, Chu-Yuan, author
Mainland China - why still backward?
Kuang Lu Publishing Service, 1983
 Buku Teks
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