The worlds of unfree labour : from indentured servitude to slavery
edited by Colin A. Palmer
Variorum, 1998
 Buku Teks
Heartfield, James, author
The British and foreign anti-Slavery Society, 1838-1956: a history
Oxford University Press, 2017
 eBooks
Bracy, Warren D.
Law, Lawyers and social change : Cases and materials on the abolition of slavery, racial segregation and inequality of educational opportunity / Warren D. Bracy
The Bobbs-Merrill Company, Inc., 1978
 Buku Teks
McDonald, Stephen L.
Petroleum conservation in the United States an economicanalysis / Stephen L. McDonald
The Johns Hopkins Press, 1971
 Buku Teks
The U.S.A. answers : a guide to understanding / edited, Kenneth E. Beer
U.S. and World Publications, Inc., 1961
 Buku Teks
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