Govier, Trudy
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Buku Teks
Stafford, John, author
University of California Press, 1952
Koleksi Publik
Sandbrook, Claire, author
Sweet & Maxwell , 2011
Buku Teks
Ignatavicius, Donna D., author
Elsevier , 2016
Buku Teks
Blais, Marie-Claire, 1939-, author
McClelland and Stewart, 1979
Buku Teks